Fix TravisCI builds (#1875)

* ember-try: Fix broken `ember-data` dependency declarations

`ember-data` is a monorepo now, so these kinds of version constraint declarations won't work anymore. see emberjs/data#6010

* CI: Use default dependencies for default scenarios

The `latest` version of ember-data (v3.11) is using async/await in Node.js code, but since we run CI on Node.js 6 it does not support that yet. This means we will have to use an older version of ember-data for now until we drop support for Node.js 6.

* CI: Allow failures for `ember-beta` scenario

see previous commit about async/await usage in recent ember-data releases

* package.json: Pin `cssstyle` to v1.2.x

see jsdom/cssstyle#95

* package.json: Pin `ember-data` to v3.7.x

Using `^3.0.0` currently resolves to v3.11.x which is not compatible with Node.js 6 anymore. v3.8.x and above have some other issues so we will use v3.7.x until we figure those out.

* Revert "Build(deps-dev): bump mermaid from 7.1.2 to 8.0.0 (#1765)"

This reverts commit 95ae7cb.

Some dependencies of `mermaid@8` are incompatible with Node.js 6

.travis.yml

@@ -15,6 +15,7 @@ env:
 jobs:
   fail_fast: true
   allow_failures:
+    - env: SCRIPT="test:one ember-beta"
     - env: SCRIPT="test:one ember-canary"
     - env: SCRIPT=test:fastboot
 
@@ -27,10 +28,10 @@ jobs:
     - name: 'Fixed Dependencies'
       install:
       - yarn install --non-interactive
-      env: SCRIPT="test:one ember-release"
+      env: SCRIPT="test"
 
     - name: 'Floating Dependencies'
-      env: SCRIPT="test:one ember-release"
+      env: SCRIPT="test"
 
     # we recommend new addons test the current and previous LTS
     # as well as latest stable release (bonus points to beta/canary)

config/ember-try.js

@@ -178,7 +178,7 @@ module.exports = function() {
           },
           npm: {
             devDependencies: {
-              'ember-data': 'emberjs/data#release',
+              'ember-data': 'latest',
               'ember-source': releaseUrl,
             },
           },
@@ -193,7 +193,7 @@ module.exports = function() {
           },
           npm: {
             devDependencies: {
-              'ember-data': 'emberjs/data#1df833396855d956b817540923dd89338463fec2',
+              'ember-data': 'beta',
               'ember-source': betaUrl,
             },
           },
@@ -208,7 +208,7 @@ module.exports = function() {
           },
           npm: {
             devDependencies: {
-              'ember-data': 'emberjs/data#1df833396855d956b817540923dd89338463fec2',
+              'ember-data': 'canary',
               'ember-source': canaryUrl,
             },
           },

package.json

@@ -65,7 +65,7 @@
     "ember-cli-shims": "^1.2.0",
     "ember-cli-sri": "^2.1.1",
     "ember-cli-uglify": "^2.0.0",
-    "ember-data": "^3.0.0",
+    "ember-data": "~3.7.0",
     "ember-debug-handlers-polyfill": "^1.1.0",
     "ember-disable-prototype-extensions": "^1.1.2",
     "ember-export-application-global": "^2.0.0",
@@ -87,7 +87,7 @@
     "handlebars": "~4.1.1",
     "loader.js": "^4.5.1",
     "marked": "^0.6.0",
-    "mermaid": "^8.0.0",
+    "mermaid": "^7.0.3",
     "mocha": "^6.0.2",
     "mocha-only-detector": "^1.0.0",
     "morgan": "^1.8.2",
@@ -114,6 +114,7 @@
     ]
   },
   "resolutions": {
+    "cssstyle": "~1.2.2",
     "jsdom": "^11.10.0"
   }
 }