Merge pull request #1 in FREEPBX/digium_phones from ~SGRIEPENTROG/digium_phones:master to master

* commit '9dd0c1dc6385fc53b27152a4bebb8dd7e5b2e247':
  Added script for building local copy of module for testing
  fixed doc formatting
  Don't delete builtin ringtones
  Fixed formatting
  removed unused functions
  reworked firmware download
  Added README
  Improvements per review comments
  Added silent record deletion for missing files
  Relocate firmware and other files downloaded by phone
Removed obsolete tags