Getsentry setup

Tested:
```
alkapone@alkapone-MS-7696:~/projects/qae$ rake raven:test
I, [2014-11-26T17:56:14.751456 #19593]  INFO -- : ** [Raven] Raven 0.12.1 ready to catch errors
Client configuration:
-> server: https://app.getsentry.com
-> project_id: 33825
-> public_key: cf84682a52fe47e4b5fb266851607ba3
-> secret_key: 4cb83ce7c0c042ceb939f3950e2043b0

Sending a test event:
-> event ID: 53fdb248e3797f3c607e6b3a285042b2

Done!
```
@matthewford right, will do