Imported GPS 5.2.1-1 source
Fixed style errors and warnings in the code.
Use the command key for keyboard shortcuts.
Build scripts for building GPS with jhbuild
patch needed for gnatcoll_shared in order to compile
Files for app bundle generation
Added GPS env variables to launcher script.

 * symlinks in Contents/MacOS are no longer neccessary
 * creating new projects from templates works
Added script for packing. Ignore bundle an dmg.
Properly include libgcc_s.1.dylib from GNAT.
New readme file

 * Condensed version of the old one
 * Information on features and download link will be moved to a website.
Store configuration in .gps-osx rather than .gps

 * This makes it possible to use GPS.app besides AdaCore's gps binary
Deleted everything to make place for new layout
Merge branch 'develop'