Add integration testing guide
Changed "RC5" to "RC6"
Merge pull request #581 from toddwprice/patch-1

Changed "RC5" to "RC6"
Changing reference to latest dev build of ember-data.js

When going through the Getting Started section myself, I would have found it more convenient to just link to the latest build of ember-data.js.
Merge pull request #582 from toddwprice/patch-3

Changing reference to latest dev build of ember-data.js
Revert "Merge pull request #582 from toddwprice/patch-3"

This reverts commit a9edfd58ab658701f3c787ae24483fb7f334f9b2, reversing
changes made to 51705dc14271f3526f6f00f785ae9ca2848f109e.

Lets keep it locked to a known-to-work ref for now
Update integration.md

Remove passing `app` to `findWithAssert`. Thanks @teddyzeenny.
Remove passing app to wait helper in testing guide
Merge pull request #1 from teddyzeenny/testing-guide

Remove passing app to wait helper in testing guide
Remove references to advanceReadiness

Thanks @ebryn.
Merge pull request #580 from kategengler/testing-guide

Add integration testing guide