Fix error in code example

test.subject(...) should be this.subject(...) inside a test
Merge pull request #57 from balinterdi/patch-1

Fix error in code example
Do not require Ember Data.

Currently, Ember Data is required and installed even if it is not
needed. The majority of functionality in `ember-qunit` is related to
Ember itself, but does not require Ember data.

This removes Ember Data as a runtime dependency, and adds a helpful
error message if it is not found when attempting to use
`moduleForModel`.
Merge pull request #62 from rjackson/do-not-require-ember-data

Do not require Ember Data.
Update readme with info on building dist/
Merge pull request #66 from bantic/update-readme-with-build-instructions

Update readme with info on building dist/
Fixed `this.$(selector)` returning cached result

Existing usage of `this.$()` will continue to function the same way, while
`this.$(selector)` will work similarly to `this.subject().$(selector)` but
will first ensure that the subject has been rendered.

Also deprecated `this.append()` in favor of its new name, `this.render()` to
help better communicate its purpose.

Fixes #55.