Copter: update firmware version to 3.0.0
PX4: Remove -Os because I've changed the px4 tree to have that as the
default
AP_Baro: TEMP parameter comment fix
autotest: fixed pymavlink tools paths
autotest: fixed handling pf pymavlink paths
Copter: update FS_THR_VALUE parameter description

One user was setting FS_THR_VALUE too low, below 900 which means
ArduCopter would not trigger when the ppmencoder pulled ch3 low after
updates from the ppmencoder stopped
Rover: update FS_THR_VALUE parameter description
Plane: update THR_FS_VALUE parameter description
autotest: fixed import of mavwp
autotest: added $HOME/APM to PYTHONPATH
Merge remote-tracking branch 'diydrones/master'