fixedwing energy_ctrl

rate limiter with GS protect
rate limiter now in m/s/s (AIRSPEED_SETPOINT_SLEW)
fix in init
[telemetry_wifi] Added telemetry wifi:
- wifi.[ch] for communication over wifi
- telemetry_wifi makefile
- adjustments to fms_network for doing a network_read
- wifi including in downlink
- wifi implementing datalink macro structure
- fixed some trailing empty lines
- radio_control_datalink makefile moved from fixedwing to shared
[conf] update MentorEnergy example after energy_ctrl update
safety feature for energy_ctrl

adjustment of v_ctl_climb_setpoint to assure safe airspeed i case of a deficiency in energy
[omap] All OMAP aditions add during ardrone development