rcS: removed unnecessary sleeps, minor code style fixes
commander: don't beep if message is not understood
mavlink: implemented multicasting between mavlink instances (two options: forwarding: forward received messages from self to other mavlink instances, passing: send out messages received from other mavlink intances over serial
Merge pull request #783 from PX4/rc_sleep_cleanup

rcS: removed unnecessary sleeps, minor code style fixes
mavlink: in normal mode transmit position setpoint and roll-pitch-yaw-thrust setpoint
mavlink: publish SYS_STATUS at constant rate, don't look at update() result
Merge pull request #811 from PX4/mavlink_sys_status_fix

mavlink: publish SYS_STATUS at constant rate
Merge pull request #810 from thomasgubler/mavlink_setpoints

mavlink: in normal mode transmit position setpoint and roll-pitch-yaw-thrust setpoint
commander: put unsupported warning back in place
mavlink: use LL_FOREACH
Send camera command to all, use own sysid
Merge remote-tracking branch 'px4/master' into mavlink_broadcast
gps driver: fake mode: lower eph and epv values in order to convince the commander that the gps signal is valid
Merge pull request #813 from PX4/gps_fake_fix

gps driver: fake mode: lower eph and epv values in order to convince the commander that the gps signal is valid
Merge pull request #791 from PX4/mavlink_broadcast

Mavlink broadcast
mavlink: accessor for _mavlink_fd
Merge pull request #814 from PX4/mavlink_fd

mavlink: accessor for _mavlink_fd
commander: handle_command: filter commands by sysid and componentid
mavlink: COMMAND_LONG stream: listen to vehicle_command uorb topic and send mavlink_msg_command_long
commander: handle_command: do not filter command if componentid == 0