document the create method in for subclasses of Ember.Object
Merge pull request #2175 from fivetanley/document-create

document the create method in for subclasses of Ember.Object
document the init function for Ember.CoreObject
remove redundant example and fix nonsensical grammar
Merge pull request #2174 from fivetanley/document-init

document the init function for Ember.CoreObject
Merge pull request #1 from emberjs/master

update from ember [ci skip]