Add unit test data
Fix up unit test makefile, add option to rull all of them
Add make tests to Makefile
unittests: Improve auto declination test, not great coverage yet.
Improve mixer test, no firm checks yet
Add S.BUS2 unit test, needs better coverage against logfile
unittests: SF0x parse test improvements
unittests: ST24: Improve test return codes
Add Travis CI support, ready for testing
Travis file: tabs to spaces
Add Travis badge
PX4IO firmware: Add required include.
README: Fix up build status badge
Updated NuttX
Output GCC version
IO firmware: Change to inttypes header
Fix Travis CI config file
Travis CI: Pick right GCC version
Manually install a known GCC version
Travis CI: Install 32 bit support libs first