update Readme.txt
increase sphere point size
fix reset to defaults
reduce mag calib point count requirement
tweak airport locations
add clear logs verify
Merge pull request #453 from wjax/master

Images GeoRef Tool Update (CAM Msg + CleanUp)
remove .gitattributes
as it breaks things
cleanup bouncycastle
vrbrain update
update px4uploader comments
uploader fix
add airport 3nm ring
tweak mag calib settings
move load airports to show during the splash screen
fix github failed dl exception
add exception handlers
Tweak airports loading
make srtm class disposable
Motor test update