Updated GPSTk to 2.3.0 release
- Removed old patches
- Added patch that fixes XCode 5.1 clang update for " gpstk/lib/Geomatics/SatPass.hpp:474:15: Friend declaration specifying a default argument must be a definition "
Merge pull request #19 from venabled/fix-gpstk2.3.0

Updated GPSTk to 2.3.0 release