Add a Tomster on any page with an Ember app

Inject a script onto pages that loads inspects the environment with
Ember.libraries and posts the data back to the content-script. The
content-script can then display a Tomster in the location bar.
Introduce a settings page and toggle for the Tomster icon
Set action title on tabs.onUpdated event
Add jshint validation to chrome extension scripts
Merge pull request #107 from mixonic/icon

Add a Tomster on any page with an Ember app
Add missing ember.prod.js file and start cleaning dist directories during build.

Thanks @mixonic for catching this.
Use Ember.Application window event to support apps with async ember.js

Fixes #55 #96
Add a hint and button to refresh the page when promises are empty