Initial PR for ember testing guide redux

Below are the examples I would like to add into these docs. If you are interested in helping, please leave a comment of which you are writing and also with the jsbin once it's completed.

Here is an example of a JSBIN with qunit testing. Please use it as a template for your examples: http://jsbin.com/mexar

Please join the IRC channel #emberjs-testing for further discussions on these examples.

# Integration Tests

* [x] Simple example using all of all different helpers - http://jsbin.com/vusaz (@cavneb)
* [x] Simple example using custom test helpers - http://jsbin.com/mexar (@cavneb)
* [x] Testing Transitions - http://jsbin.com/goruc/2/ (@cavneb)
* [x] Mocking ajax calls using ic-ajax (w/o Ember Data) - http://emberjs.jsbin.com/OxIDiVU/361/edit (@kingpin2k)
* [x] Mocking ajax calls using ic-ajax (w/ Ember Data) - http://emberjs.jsbin.com/OxIDiVU/363/edit (@kingpin2k)

# Unit Tests

### Controllers

* [x] Testing functions - http://jsbin.com/hobuq/2 (@coderstash)
* [x] Testing actions - http://jsbin.com/laqed/1 (@coderstash)
* [x] Testing computed properties - http://jsbin.com/fixil/1 (@coderstash)
* [x] Testing `needs` - http://jsbin.com/fixil/2 (@coderstash)

### Routes

* [x] Testing functions
* [x] Testing actions
* [x] Testing different callbacks (beforeModel/afterModel/etc)

### Handlebars Helpers

* [x] Testing unbound helpers - http://jsbin.com/yiven (@cavneb)
* [x] Testing bound helpers - http://jsbin.com/yiven (@cavneb)

### Models

* [x] Testing functions - http://jsbin.com/weyol/2/edit (@jagthedrummer)
* [x] Testing computed properties - http://jsbin.com/dapux/1/edit (@jagthedrummer)
* [x] Testing needs/belongsTo - http://jsbin.com/zoxoz/1/edit (@jagthedrummer)

### Views

* [x] Testing functions
* [x] Testing computed properties
* [x] Testing rendered content (template)
* [x] Testing interaction (click/etc)

### Components

* [x] Testing functions
* [x] Testing with context
* [x] Testing with provided templates
* [x] Testing interaction (click/etc) - http://jsbin.com/qoyinucu (@kingpin2k) - cleaned up: http://jsbin.com/qoyinucu/34/edit?html,js,output