Use teaspoon to run javascript tests

Refs #2595

test/javascripts/test_helper.js

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+// Teaspoon includes some support files, but you can use anything from your own support path too.
+// require support/expect
+// require support/sinon
+//= require support/chai
+// require support/chai-jq-0.0.7
+// require support/your-support-file
+//
+// PhantomJS (Teaspoons default driver) doesn't have support for Function.prototype.bind, which has caused confusion.
+// Use this polyfill to avoid the confusion.
+//= require support/phantomjs-shims
+//
+// You can require your own javascript files here. By default this will include everything in application, however you
+// may get better load performance if you require the specific files that are being used in the spec that tests them.
+//= require application
+//
+// Deferring execution
+// If you're using CommonJS, RequireJS or some other asynchronous library you can defer execution. Call
+// Teaspoon.execute() after everything has been loaded. Simple example of a timeout:
+//
+// Teaspoon.defer = true
+// setTimeout(Teaspoon.execute, 1000)
+//
+// Matching files
+// By default Teaspoon will look for files that match _spec.{js,js.coffee,.coffee}. Add a filename_spec.js file in your
+// spec path and it'll be included in the default suite automatically. If you want to customize suites, check out the
+// configuration in teaspoon_env.rb
+//
+// Manifest
+// If you'd rather require your spec files manually (to control order for instance) you can disable the suite matcher in
+// the configuration and use this file as a manifest.
+//
+// For more information: http://github.com/modeset/teaspoon
+//
+// Chai
+// If you're using Chai, you'll probably want to initialize your preferred assertion style. You can read more about Chai
+// at: http://chaijs.com/guide/styles
+//
+// window.assert = chai.assert;
+window.expect = chai.expect;
+// window.should = chai.should();