Get HockeyApp from Cocoapods
Rakefile and travis updates in an attempt to fix the CI build
Fighting Travis a bit here.
Build [20734414](https://travis-ci.org/numist/Switch/builds/20734414) didn't go so well.
Build 20734668 also failed for no obvious reason, let's try changing the Ruby
Merge pull request #73 from numist/numist/hockey-pod

HockeyApp integration using Cocoapods

Paired with @mtitolo.