Build script and hockeyapp

* Add Hockeyapp.net SDK for distribution and crash reporting
* First pass at a build script that dumps an ad-hoc signed ipa
  file in the build directory and passes in Hokeyapp.net API
  keys  to the build from a private repository.
* Automatically upload build to hockeyapp.net if apikeys.txt exists 
  in dependencies directory
* Will rebase this PR on master once before merging
  after firmware update branch is merged since the build
  script depends on updatedepends.sh being run.
Do we need SRCROOT to remain quoted? (ditto for two other similar changes)