Add Hockey App

Add HockeyApp

Couple things to point out.
- Thought of a way to get around clash with Hockey App and Crittercism, most of the hackery is in the podspec in [4d09287](https://github.com/confidenceJuice/ARAnalytics/commit/4d09287f89d46ed83c1ae5d728b54cc9f5e62b4e) and explained in the comments. What do you think?

- Considered adding an extra method setupHockeyAppWith
BetaIdentifier:LiveIdentifier: to get behaviour as is suggested in docs [here](http://support.hockeyapp.net/kb/client-integration/hockeyapp-for-ios#modify-code)

- What should be the default implementation of their customDeviceIdentifierForUpdateManager: delegate method? it relies on pre compile Macros which we probably shouldn't assume, I switched it to an `ifdef` as apposed to an `ifndef` as they do [here](http://support.hockeyapp.net/kb/client-integration/hockeyapp-for-ios#submit-the-udid) to be on the safe side.

- tested live seems ok, but couldn't get it to work with demo app, had to use one of my own. Hence worth double checking :)