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.

# Integration Tests

* [ ] Simple example using all of all different helpers
* [ ] Simple example using custom test helpers
* [ ] Testing Transitions
* [ ] Mocking ajax calls using ic-ajax (w/o Ember Data)
* [ ] Mocking ajax calls using ic-ajax (w/ Ember Data)

# Unit Tests

### Controllers

* [ ] Testing functions
* [ ] Testing actions
* [ ] Testing computed properties
* [ ] Testing `needs`

### Routes

* [ ] Testing functions
* [ ] Testing actions
* [ ] Testing different callbacks (beforeModel/afterModel/etc)

### Handlebars Helpers

* [ ] Testing unbound helpers
* [ ] Testing bound helpers

### Models

* [ ] Testing functions
* [ ] Testing computed properties
* [ ] Testing needs/belongsTo

### Views

* [ ] Testing functions
* [ ] Testing computed properties
* [ ] Testing rendered content (template)
* [ ] Testing interaction (click/etc)

### Components

* [ ] Testing functions
* [ ] Testing with context
* [ ] Testing with provided templates
* [ ] Testing interaction (click/etc)