Add tests for calling jQuery.ajax from DS.RESTAdapter
Fix: unload record with relationships

- calling `clearRelationships` before changing record state,
  otherwise it fails, because properties try to update removed
  relationships

- Transaction commit failed when an unloaded record was in the
  `transaction.bucketForType.updated` array. Using recordIsMoving fixed
  this issue
fix test description
fixed issue #582
added adapter integration test for dirtyRecordsForAttributeChange
Failing test: 'When a record is loaded a second time, isLoaded should stay true'
Add docs directory with package.json and yuidoc.json

`EMBER_PATH=../ember-data rake preview` in ember-website does not quite
work yet. I don't have time at the moment to get it working completely,
but let's have the docs directory as a starting point.
Add live query test for RecordArray
Potential fix for #731
Use Ember.isNone for null check instead of !

Using !id to check for a null belongsTo id was causing relationships to be treated as missing.
Remove unused method

DS.Model#setProperty is no longer working.
Move createSerializedForm to DS.Serializer.  Serializer calls the routine currently, but it's only defined in the JSON and Fixture implementations.
Added 'isLoading' flag to DS.State
pushData and load now call loadData instead of duplicating code
automatically publish passing master branch builds to s3

This commit will publish passing builds of the master branch to s3 for
convenient downloading.

Files created if the build is successful:
ember-data-latest.js
ember-data-latest.min.js
ember-data-<revision>.js
ember-data-<revision>.min.js

Any *-latest*.js files will be overwritten to the build that passes and
runs `rake publish_build`.

To add credentials to your travis instance:

gem install travis
travis encrypt S3_ACCESS_KEY_ID=yourkey --add
travis encrypt S3_SECRET_ACCESS_KEY=yourkey --add

You'll also need to update the S3_BUCKET_NAME=yourbucketname in
.travis.yml
Enforce more methods on serializer

* extractId
* extractAttribute
* extractHasMany
* extractBelongsTo
* createSerializedForm
* addId
* addAttribute
* addHasMany
* addBelongsTo
Make Ember.assert statement a single line

Otherwise it won't be removed for a production build.
Merge pull request #846 from igorT/refactor_load_data

pushData and load now call loadData instead of duplicating code
Merge pull request #441 from mhelabs/rest_adapter_ajax_tests

Add tests for calling jQuery.ajax from DS.RESTAdapter
Merge pull request #567 from ppcano/unload-fix

Fix: unload record with relationships