Windows build fix attempt
Merge pull request #162 from PX4/windows_build_fix

Windows build fix attempt
Added ubx configuration CFG-NAV5 to airborne with less than 2g acceleration (compiling, not tested)
The config message was wrong, corrected (not tested)
The CFG-NAV5 dynamic model is now checked as well
ubx with 38400 working, all messages seem to arrive, configuration procedure is still funny (work in progress)
Ubx configuration working again, gps app is still complicated and big but should be wrking better now