Fixes HockeyApp Warnings

Fixes #2854

We were getting several warnings due to duplicate HockeyApp macro definitions. Since we're using HockeyApp via cocoapods, i've just nuked those macros from the main project.

(Which is what was suggested [here](https://github.com/bitstadium/HockeySDK-iOS/issues/116) as a fix, as well!). 

/cc @diegoreymendez + @sendhil