Add defeatureify to Travis config.
Only throw an initialValue error if it is null or undefined (i.e. not 0 or some other falsy value)
Merge pull request #3327 from matthooks/master

Allow reduceComputed to have an initial value of 0.
Add shortcut for whitelisting all modifier keys on {{action}}
Modifier key-independent action helper use cases can be less verbose and more future-proof.
fixing grammer in computed property docs
Merge pull request #3335 from GavinJoyce/master

fixing grammer in computed property docs
Merge pull request #3323 from codefox421/action-modkeys-any

Add shortcut to action helper for whitelisting all modifier keys
Add test for using concatenated properties with functions
Close #3307 – Fix unexpected behavior with functions in concatenated properties
Fix grammar in CONTRIBUTING.md
Improve docs for CoreObject#concatenatedProperties
Documents `{{link-to "route" someId}}` behavior
Update link_to.js

add description for `disabled` and `disabledWhen` properties for `link-to` handlebar helper.
components should declare actions in the actions hash
Merge pull request #3336 from sly7-7/component-doc-update

update docs to reflect that components should declare actions in an `actions` hash
Merge pull request #3339 from mbixby/master

Close #3307 – Fix unexpected behavior with functions in concatenated properties
Update Ember.TextArea and Ember.TextField documentation

text_area.js:
 * update @extends documentation from `Ember.View``` to `Ember.Component`
 * reference `handlebars.helpers.textarea`

text_field.js:
 * update @extends documentation from `Ember.View` to `Ember.Component`
 * reference `handlebars.helpers.input``

controls.js
 * add note for Ember.TextArea and Ember.TextField extending from Ember.Component
 * add references to Ember.Component; warning about not inheriting parent view controller
Create Ember.libraries for keeping track of versions for debugging. emberjs/data#1051
Merge pull request #3322 from rjackson/require_defeatureify

Add defeatureify to Travis config.
Use EmberDefeatureify