automated dev branch checkout
automated dev branch checkout

Added a check to see if branch is already checked out.
Added an option for the user to skip checkout
Added a check to see if automatic checkout was successful, with an abort if not.

smartdevicelink/sdl_ios,smartdevicelink/sdl_ios,smartdevicelink/sdl_ios,smartdevicelink/sdl_ios,smartdevicelink/sdl_ios