Correct misspelling of sponsors
First cut generic Contributing.md file for Travis

Could use some expansion under the actual PR submission notes
Add note about reporting security issues

As recommended by @drogus
Add chunk buffer
A few improvements for ChunkBuffer

* insert available items at once
* allow to use pushObject on buffer itself
* add a test using arrayObserver to make sure that it fires only when
  elements are added to arrangedContent
Finish ChunkBuffer implementation and integrate it with Artifact
Fix fetching worker name
Add some debug info
More debug output
Merge branch 'ps-chunked-buffer'
No need to use vnd extensions if version is already given
Show appropriate message if repository was not found
Show appropriate message when the repository has no builds
Merge branch 'master' into ps-ember-update

Conflicts:
	assets/scripts/app/models/artifact.coffee
	assets/scripts/app/store.coffee
	assets/scripts/app/views/job.coffee
	assets/scripts/spec/spec_helper.coffee
Merge pull request #131 from fionatay/master

Correct spelling in translation key
Merge pull request #145 from nschonni/patch-1

First cut generic Contributing.md file for Travis
Run rake localeapp:update
Merge branch 'master' into ps-ember-update
Bring back log engine from master
Update Ember