Plane: enable failsafe battery reporting
AP_Notify: grab initial flags state in init()

this prevents annoying tones on startup of APM:Plane
Rover: prevent arming tone on startup
Plane: prevent arming tone on startup
Plane: set failsafe_radio AP_Notify bits
Iris Params: reduce Yaw IMAX and increased Loiter speed
Copter Motors: increase MOT_SPIN_ARMED to int16
Copter: AC3.1-rc2 version and release notes
Copter: update AC3.1-rc2 release notes for COMPASS_ORIENT change
Iris Params: set COMPASS_ORIENT to 0
Iris Params: update volt divider for 4-in-1 ESC
AP_HAL: added hal.gpio->usb_connected() function

this replaces the USB_MUX_PIN on APM2, and works on PX4 and FMUv2
Plane: use new usb_connected() function
Copter: use new usb_connected() HAL function
Rover: use new HAL usb_connected() function
AP_HAL: convert to unix file format
AP_Math: fixed DOS CR/LF errors
GCS_MAVLink: remove CR/LF
AP_Notify: convert to unix style file
AP_InertialSensor: removed the flash_leds() callback

AP_Notify now handles this