Fix component name in documentation example
Merge pull request #3593 from denisnazarov/patch-2

Fix component name in documentation example
Make Ember.Error available in ember-metal.
Merge pull request #3594 from rjackson/ember_error_all_the_things

Make Ember.Error available in ember-metal.
documentation typo fixes
Merge pull request #3595 from bradoyler/patch-1

documentation typo fixes