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
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