Merge RobotWebTools#89 into develop

Also add back build folder, so users can do ```bower install roslibjs#develop``` - this should also put RobotWebTools#85 and RobotWebTools#86 to rest.

[ ] [Register](http://bower.io/#registering-packages) roslibjs with bower

bower.json

@@ -0,0 +1,28 @@
+{
+  "name": "roslibjs",
+  "description": "roslibjs is the core JavaScript library for interacting with ROS from the browser. It uses WebSockets to connect with rosbridge and provides publishing, subscribing, service calls, actionlib, TF, URDF parsing, and other essential ROS functionality. roslibjs is developed as part of the Robot Web Tools effort.",
+  "version": "0.9.0",
+  "homepage": "https://github.com/RobotWebTools/roslibjs",
+  "authors": [
+    "Russell Toris<[email protected]>",
+    "Jihoon Lee <[email protected]>",
+    "Brandon Alexander <[email protected]>",
+    "David Gossow <[email protected]>",
+    "Benjamin Pitzer <[email protected]>"
+  ],
+  "main": "build/roslib.js",
+  "license": "BSD",
+  "ignore": [
+    "bower_components",
+    "doc",
+    "examples",
+    "include",
+    "node_modules",
+    "src",
+    "test",
+    "utils"
+  ],
+  "dependencies": {
+    "eventemitter2": "0.4.11"
+  }
+}