#343 - Fixed updated development provisioning profile ID
#343 - Updated the credential script to use the file set in the environment variable
#343 - Got push working for the internal build

Fixed provisioning profile to the newest one having push enabled.  Added conditional statements to add the additional parameters needed for internal build push to work right with wpcom.
Merge pull request #371 from wordpress-mobile/internal-build

Internal build - push and wpcom secret for internal set up