Update README to include documentation about camelizeKeys

I had to dig in the source code to find this very useful feature.
Merge pull request #110 from lagartoflojo/patch-1

Update README to include documentation about camelizeKeys
Better camelize fix
release 0.0.3
Merge pull request #112 from ebryn/better-camelize-fix

Better camelize fix
Prevent creating models using camelizeKeys from losing track of data.
Merge pull request #116 from ebryn/fix-create-record-with-camelize-keys

Prevent creating models using camelizeKeys from losing track of data.
release 0.0.4
Added an options.key to Ember.attr()
Initial stab at writing documentation for relationships
Fixed typos noted by @stravid

Spelling was never one of my strongest skills
Merge pull request #125 from guilhermeaiolfi/attributes-key-datakey

Added an options.key to Ember.attr()
Merge pull request #124 from raytiley/relationship-docs

Initial stab at writing documentation for relationships
Update README.md
Use relationship key in toJSON
We shouldn't be passing the relationshipKey to dataKey
Fix object removal on HasManyArray and EmbeddedHasManyArray.

Closes #126.
Improve findMany condition.

Closes #120.
Fix flakey test
Merge remote-tracking branch 'remotes/upstream/master' into fix_serialization_of_belongs_to_relationship_where_type_is_specified_as_string

Conflicts:
	packages/ember-model/lib/model.js
	packages/ember-model/tests/model_test.js