Do not build the docs for `.cachable`. Fixes #2329.

Also, drop a lingering use of the function in tests.
Do not flag .generateController for documentation.
Merge pull request #2496 from mixonic/cacheable-documentation

Drop .cacheable documentation
Fixes Ember.EnumerableUtils without extend prototypes
Merge pull request #2497 from stefanpenner/master

Fixes Ember.EnumerableUtils without extend prototypes
don't rely on EXTEND_PROTOTYPES
fix failing tests for outerHTML fallback
Document run.scheduleOnce, truncate run.once docs. Fixes #2132.

This is a tradeoff to avoid repeating the docs for scheduleOnce on
once. Most people may intend to use run.once, but scheeduleOnce is
certainly widely enough used to deserve documentation of it's own.
Merge pull request #2498 from stefanpenner/master

don't rely on EXTEND_PROTOTYPES
Merge pull request #2500 from fivetanley/fix-firefox10-fallback

fix failing tests for outerHTML fallback
Merge pull request #2499 from mixonic/scheduleOnce-documentation

Document run.scheduleOnce, truncate run.once docs. Fixes #2132.
Remove assigned but unused variable
Use `jQuery.is(':disabled')` instead of `jQuery(':disbled').length` for Opera
Merge pull request #2501 from tricknotes/remove-unused

Remove assigned but unused variable
Merge pull request #2502 from tricknotes/fix-failing-test-in-opera

Use `jQuery.is(':disabled')` instead of `jQuery(':disbled').length` for Opera
Include ember-testing in full build
Documents {{linkTo}}
Merge pull request #2503 from trek/document-link-to

Documents {{linkTo}}
Don't apply href to LinkView that isn't using 'a' tag
Merge pull request #2505 from trek/dont-apply-href-on-linkto-if-not-anchor-tag

Don't apply href to LinkView that isn't using 'a' tag