Add explaining comment to reduce the chance of me breaking this.
Trying to get the library building again on TravisCI using xctool
It turns out that Travis CI supports xctool natively. Let's try that.

Leaving the blank install: phase as I do not want pod install to run.
This should prevent pod install
Just build for simulator for now, due to Kiwi issues
Make sure the OSX sample app connects
Remove the OSX sample app as it's useless. I'm going to start a 
new one in a separate project.
Pusher.h should be public
Set the header dir and exclude private headers. Bump version.
Merge branch 'release/1.5' into introduce-retry-limits.

This should get the branch building on Travis CI.