Copter: only report gps glitch when usb disconnected
Copter: add RC_FEEL_RP parameter

Values from 0 ~ 100 control amount of filtering on roll and pitch input.
100 = no filter so crisp feel, 0 = a lot of filtering so very sluggish
response
Copter: firmware to AC3.1.2-rc2
Copter: firmware to AC3.1.2
Merge remote-tracking branch 'diydrones/ArduCopter-3.1.2' into hybrid-thrasst

Conflicts:
	ArduCopter/Parameters.h
Add a 'gps passthrough' mode to allow direct communication with the
GPS via the console.
Add facility to record raw UBLOX data.
Small fixes for GPS passthrough
Fixes to the Ublox SD card logging (not yet complete)