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
Add live query test for RecordArray
Add Ember.Date.parse to fix cross browser bugs parsing ISO-8601 dates
Remove unused method

DS.Model#setProperty is no longer working.
Fix typo in addRelationships documentation
Add assertion in `relatedTypes` to catch undefined relations
Support create/update/delete
Updated README with a little more explanation about the Adapters and a link back to the guides to read more about the RESTAdapter.
Add assertion for undefined type in a relationship
Fix missing trailing semicolon
pushData and load now call loadData instead of duplicating code
Add assertion on BasicAdapter.findHasMany
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
Added support for polymorphic associations.

App.User = DS.Model.extend({
 messages: DS.hasMany(App.Message, {polymorphic: true})
});

App.Message = DS.Model.extend({
  created_at: DS.attr('date'),
  user: DS.belongsTo(App.User)
});

App.Post = App.Message.extend({
  title: DS.attr('string')
});

App.Comment = App.Message.extend({
  body: DS.attr('string'),
  message: DS.belongsTo(App.Message, {polymorphic: true})
});

You need to configure the serializer to map to the correct type:

DS.RESTAdapter.configure('App.Post' {
  alias: 'post'
});
DS.RESTAdapter.configure('App.Comment' {
  alias: 'comment'
});

Initializing an alias will automatically allow you to sideload this
type. The support for sideloadAs is only for backward compatibility.

Two hooks exist for the serialization and materialization of an embedded
polymorphic association:
* `addType` that adds the record's type to the serialized data
* `extractEmbeddedType` that retrieves the record's type from the
payload.

Both hooks rely in the JSONSerializer on `keyForEmbeddedType`, which returns the string used to
represent the record's type in the payload. The default value is
`'type'`
Fix typo in serializer.js
use correct adapter methods