diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..6044ede
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,10 @@
+---
+
+install:
+  - 'sudo apt-get update -qq'
+  - 'sudo apt-get install -qq oracle-java8-installer'
+  - 'sudo update-java-alternatives -s java-8-oracle'
+  - 'sudo pip install html5validator'
+
+script:
+  - "make check"
diff --git a/.yamllint b/.yamllint
new file mode 100644
index 0000000..d26c507
--- /dev/null
+++ b/.yamllint
@@ -0,0 +1,8 @@
+---
+
+extends: default
+
+rules:
+  line-length:
+    max: 1000
+    level: warning
diff --git a/Makefile b/Makefile
index c9a695d..d67d6ca 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,13 @@ list:
 	@$(MAKE) -pRrq -f $(lastword $(MAKEFILE_LIST)) : 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | sort | egrep -v -e '^[^[:alnum:]]' -e '^$@$$' | sed 's/^/    /'
 ## }}}
 
+.PHONY: check
+check: check-html
+
+.PHONY: check-html
+check-html:
+	html5validator --root . --blacklist js opening_hours.js --ignore-re 'Start tag seen without seeing a doctype first'
+
 ## Make this project ready to be served by a webserver.
 .PHONY: ready-for-hosting
 ready-for-hosting: dependencies-get
@@ -18,11 +25,12 @@ opening_hours+deps.min.js:
 	$(MAKE) --directory opening_hours.js/ opening_hours+deps.min.js
 
 taginfo.json: ./opening_hours.js/gen_taginfo_json.js ./opening_hours.js/related_tags.txt taginfo_template.json
-	$< --key-file ./opening_hours.js/related_tags.txt --template-file taginfo_template.json > "$@"
+	opening_hours_map --key-file ./opening_hours.js/related_tags.txt --template-file taginfo_template.json > "$@"
 
 .PHONY: dependencies-get
 dependencies-get: js/OpenLayers-$(OpenLayersVersion)/OpenLayers.js
-	git submodule update --init --recursive
+	git submodule update --init
+	cd opening_hours.js/ && git verify-commit HEAD && git submodule update --init --recursive
 
 js/OpenLayers-$(OpenLayersVersion)/OpenLayers.js:
 	-wget --no-clobber -O js/OpenLayers-$(OpenLayersVersion).tar.gz https://github.com/openlayers/openlayers/releases/download/release-$(OpenLayersVersion)/OpenLayers-$(OpenLayersVersion).tar.gz
@@ -35,6 +43,10 @@ deploy-on-all-servers: deploy-on-openingh.openstreetmap.de deploy-on-ypid.de
 deploy-on-openingh.openstreetmap.de: opening_hours+deps.min.js
 	rsync  --archive * gauss.osm.de:~/www -v
 
+## Custom deployment method which allows me to fully isolate the development and build environment from the server.
 .PHONY: deploy-on-openingh.openstreetmap.de
 deploy-on-ypid.de: opening_hours+deps.min.js
-	rsync  --archive * osm@www.pubsrv.ypid.de:/srv/www/osm/sites/openingh.ypid.de/public -v
+	rm -rf "/tmp/opening_hours_map"
+	mkdir --parents "/tmp/opening_hours_map"
+	/bin/tar --exclude-vcs --exclude='./js/*.tar.gz' --exclude='./js/OpenLayers-$(OpenLayersVersion)/doc' --exclude='./opening_hours.js/node_modules/bower' --exclude='./opening_hours.js/submodules/panieravide.github.io/id-indoor' --exclude='./opening_hours.js/submodules/panieravide.github.io/pic4carto' --no-acls -czf - . | /bin/tar -xz --directory "/tmp/opening_hours_map" -f -
+	qvm-copy-to-vm s-cm "/tmp/opening_hours_map"
diff --git a/docs/deployment.rst b/docs/deployment.rst
index 83d52a1..4855de1 100644
--- a/docs/deployment.rst
+++ b/docs/deployment.rst
@@ -23,7 +23,7 @@ The following Webserver configuration is currently deployed:
        name: [ 'openingh.ypid.de', 'openingh.openstreetmap.de' ]
        owner: 'osm'
        csp: True
-       csp_policy: "default-src 'none'; script-src 'self' 'unsafe-inline'; connect-src https://overpass-api.de https://nominatim.openstreetmap.org https://localhost:8111; img-src 'self' data: https://*.tile.openstreetmap.org https://*.tile.opencyclemap.org; style-src 'self' 'unsafe-inline'"
+       csp_policy: "default-src 'none'; script-src 'self' 'unsafe-inline' https://code.jquery.com; connect-src https://overpass-api.de https://nominatim.openstreetmap.org https://localhost:8111; img-src 'self' data: https://*.tile.openstreetmap.org https://*.tile.opencyclemap.org; style-src 'self' 'unsafe-inline'"
        location_list:
          - pattern: '/stats'
            options: 'return 307 http://openingh.openstreetmap.de$request_uri;'
diff --git a/index.html b/index.html
index af0302a..feb3f33 100644
--- a/index.html
+++ b/index.html
@@ -1,25 +1,31 @@
 <html>
     <head><!-- {{{ -->
         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
-        <meta name="referrer" content="no-referrer">
+        <meta name="referrer" content="no-referrer" />
         <title>Map with layer for the tag opening_hours based on OpenStreetMap</title>
-        <link rel="icon" type="image/png" href="img/favicon.png">
+        <link rel="icon" type="image/png" href="img/favicon.png" />
         <meta name="description" content="Auswertung des Tags opening_hours auf einer Karte von OpenStreetMap" />
         <script type="text/javascript" src="js/OpenLayers-2.13.1/OpenLayers.js"></script>
         <script type="text/javascript" src="js/OpenStreetMap.js"></script>
         <script type="text/javascript" src="js/popupmarker.js"></script>
         <script type="text/javascript" src="js/loadstatus.js"></script>
         <script type="text/javascript" src="js/zoomstatus.js"></script>
+        <script src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha384-rY/jv8mMhqDabXSo+UCggqKtdmBfd3qC2/KvyTDNQ6PcUJXaxK1tMepoQda4g5vB" crossorigin="anonymous"></script>
         <script type="text/javascript" src="opening_hours.js/opening_hours+deps.min.js"></script>
-        <script type="text/javascript" src="opening_hours.js/bower_components/jquery/dist/jquery.min.js"></script>
-        <script type="text/javascript" src="opening_hours.js/js/countryToLanguageMapping.js"></script>
-        <script type="text/javascript" src="opening_hours.js/js/helpers.js"></script>
-        <script type="text/javascript" src="js/main.js"></script>
+        <script type="text/javascript" src="opening_hours.js/node_modules/i18next-client/i18next.min.js"></script>
         <script type="text/javascript" src="opening_hours.js/node_modules/moment/min/moment-with-locales.min.js"></script>
         <script type="text/javascript" src="opening_hours.js/js/i18n-resources.js"></script>
         <script type="text/javascript" src="opening_hours.js/js/opening_hours_table.js"></script>
+        <script type="text/javascript" src="opening_hours.js/js/helpers.js"></script>
+        <script type="text/javascript" src="opening_hours.js/js/countryToLanguageMapping.js"></script>
+        <script type="text/javascript" src="js/main.js"></script>
         <link rel="stylesheet" href="opening_hours.js/css/table.css"/>
         <link rel="stylesheet" href="css/default.css"/>
+        <script type="text/javascript">
+            if (document.title !== i18n.t('texts.heading map')) {
+                document.title = i18n.t('texts.heading map');
+            }
+        </script>
     </head> <!-- }}} -->
     <body><!-- {{{ -->
         <noscript>You don‘t have JavaScript enabled and that is a good thing but this tool makes heavy use of JavaScript so you need to enable it in order to use this tool. If you don’t trust the code that is going to be executed that is good as well. I encourage you to read all the source code on <a href="https://github.com/opening-hours/opening_hours.js">Github</a>. Also note that every commit and all releases are GPG signed. You might want to check this out as well :) Stay safe.</noscript>
@@ -28,7 +34,6 @@
 
         <script type="text/javascript">
             document.write('<h1>' + i18n.t('texts.heading map') + '</h1>');
-            document.title = i18n.t('texts.heading map');
             document.write(getUserSelectTranslateHTMLCode());
 
             function submitenter(myfield,e) {
@@ -57,9 +62,8 @@
             <script type="text/javascript">
                 document.write('<strong>' + i18n.t('texts.config POIs') + '</strong>:');
             </script>
-            <select id="tag_selector_input" name="tag_selector_input">
-            </select>
-            <form id="userKey" action="">
+            <select id="tag_selector_input" name="tag_selector_input"></select>
+            <form id="userKey" action="#">
             <input id="key" style="width:20%" name="key" onKeyPress="return submitenter(this,event)" />
             </form>
             <script type="text/javascript">
@@ -70,6 +74,7 @@
             </script>
         </div>
 
+        <p>
         <script type="text/javascript">
             document.write(i18n.t('texts.map is showing', { wikiUrl: wiki_url }));
             document.write('<ul>');
diff --git a/js/main.js b/js/main.js
index ae2d376..42c1c18 100644
--- a/js/main.js
+++ b/js/main.js
@@ -2,26 +2,28 @@ var repo_url = 'https://github.com/opening-hours/opening_hours_map';
 var html_url = 'http://openingh.openstreetmap.de/';
 var wiki_url = 'https://wiki.openstreetmap.org/wiki/Key:opening_hours';
 var evaluation_tool_url = 'evaluation_tool/';
-var map;
 
-var nominatim_data_global = {};
-
-var opening_hours = require('opening_hours');
-/* Does not accept language change in Browser. Probably not the
- * correct version as it was bundled for NodeJS.
- */
-// var moment = require('moment');
-var i18n = require('i18next-client');
+/* Source ../opening_hours.js/related_tags.txt */
+var related_tags = [
+    'opening_hours',
+    'opening_hours:kitchen',
+    'opening_hours:warm_kitchen',
+    'happy_hours',
+    'delivery_hours',
+    'opening_hours:delivery',
+    'lit',
+    'smoking_hours',
+    'collection_times',
+    'service_times',
+    //
+    // 'fee',
+];
 
 if (!document.onLoadFunctions) {
     document.onLoadFunctions = new Array();
     window.onload = function () { for (var i=0; document.onLoadFunctions.length>i;i++) document.onLoadFunctions[i](); }
 }
 
-var poi_layer;
-
-var permalinkParams = {};
-var permalinkObject;
 
 function Evaluate(number, reset, value) {
     window.open(evaluation_tool_url + '?EXP='+encodeURIComponent(value), '_blank');
@@ -43,34 +45,24 @@ function editPopupContent(content, lat, lon, type, id, oh_value) {
     return content;
 }
 
-var tmp = 0;
-/* Source ../opening_hours.js/related_tags.txt */
-var related_tags = [
-    'opening_hours',
-    'opening_hours:kitchen',
-    'opening_hours:warm_kitchen',
-    'happy_hours',
-    'delivery_hours',
-    'opening_hours:delivery',
-    'lit',
-    'smoking_hours',
-    'collection_times',
-    'service_times',
-    //
-    // 'fee',
-];
+function createMap() {
 
-document.onLoadFunctions.push ( function () {
+    var map;
+    var poi_layer;
+    var nominatim_data_global = {};
+    var permalinkParams = {};
+    var permalinkObject;
 
     window.useUserKey = function (key) {
-        console.log(key);
-        if (related_tags.indexOf(key) !== -1) { /* Add the new key to related_tags. */
+        if (related_tags.indexOf(key) === -1) { /* Add the new key to related_tags. */
+            var opt = document.createElement('option');
+            opt.value = key;
+            opt.innerHTML = key;
             var select = document.getElementById('tag_selector_input');
+            select.appendChild(opt);
             related_tags.push(key);
-            select.options[select.options.length] = new Option(key, select.options.length);
-        } else {
-            document.getElementById('tag_selector_input').selectedIndex = related_tags.indexOf(key);
         }
+        document.getElementById('tag_selector_input').selectedIndex = related_tags.indexOf(key);
     };
 
     window.keyChanged = function() {
@@ -521,22 +513,25 @@ document.onLoadFunctions.push ( function () {
                     return true;
             }
         },
+    }));
+    /* }}} */
+
+    //----------------------------------------------------------------------------
+    //    Stelle bestimmten Bereich in maximaler Groesse dar
+    //----------------------------------------------------------------------------
+
+    if (!map.getCenter()) {
+        map.zoomToExtent(
+            new OpenLayers.Bounds(7.1042, 50.7362, 7.1171, 50.7417).
+                transform(new OpenLayers.Projection('EPSG:4326'), map.getProjectionObject())
+        );
     }
-));
-/* }}} */
-
-//----------------------------------------------------------------------------
-//    Stelle bestimmten Bereich in maximaler Groesse dar
-//----------------------------------------------------------------------------
-
-if (!map.getCenter()) {
-    map.zoomToExtent(
-        new OpenLayers.Bounds(7.1042, 50.7362, 7.1171, 50.7417).
-            transform(new OpenLayers.Projection('EPSG:4326'), map.getProjectionObject())
-    );
+    /* }}} */
+
+    document.getElementById('tag_selector_input').onchange = keyChanged;
 }
-/* }}} */
 
-document.getElementById('tag_selector_input').onchange = keyChanged;
 
+$(document).ready(function () {
+    createMap();
 });
diff --git a/opening_hours.js b/opening_hours.js
index 67253ed..cb887f6 160000
--- a/opening_hours.js
+++ b/opening_hours.js
@@ -1 +1 @@
-Subproject commit 67253edcd9993a25bfc9120509fe4dcea5e02114
+Subproject commit cb887f6dcc7aa0a66454beb542cbc3024c58710e