Relocate firmware and other files downloaded by phone
Added silent record deletion for missing files
Improvements per review comments
Added README
reworked firmware download
removed unused functions
Fixed formatting
Merge branch 'master' of http://stash.digium.com/stash/scm/freepbx/digium_phones

Conflicts:
	module.xml
Don't delete builtin ringtones
fixed doc formatting
Added script for building local copy of module for testing