Adding enum field to int types that are linked with an enum
Added the ability to set the digital relays on the APM
Merge branch 'master' into enable_set_relay
pymavlink: allow conditionals on parameters in DF logs
pymavlink: reduced CPU usage on failed reads looping
pymavlink: fixed time handling in mavgraph
common.xml: added RC_CHANNELS message with 18 channels

see discussion on drones-discuss with Lorenz
pymavlink: raise version
pymavlink: fixed sleep time in blocking recv handling
pymavlink: fixed sequence number handling

this is what caused mavtester to lose packets
pymavlink: raise version
ardupilotmega: added MAV_CMD_DO_FENCE_ENABLE
common: added MAV_SYS_STATUS_GEOFENCE to MAV_STATUS_SENSOR field
XML: added MAV_CMD_NAV_SPLINE_WAYPOINT

This is used to create a spline path waypoint
pymavlink: raise version
pymavlink: draw spline waypoints on map
common.xml: added SERIAL_CONTROL message

this message allows for control of a serial device on a remote
node. This can be used to (for example) update the firmware on a 3DR
air radio by connecting to a Pixhawk over USB.
pymavlink: added MavlinkSerialPort class

this class gives remote serial control of a device via SERIAL_CONTROL
messages
pymavlink: raise version
Added quaternion based gimbal control message