skeleton for adafruiti2cpwm driver
bring up adafruit i2c pwm driver

includes the test function, fucntionality verified with scope and servo
 adafruit i2c pwm: listen to uorb for setpoints
rename adafruiti2cpwm to pca9685
Merge pull request #1296 from PX4/adafruiti2cpwm

Adafruit i2c to pwm board driver
mavlink: missions manager compID cleanup, use the common compID, stict compID checks for incoming messages
pca9685: correct input scaling
Merge pull request #1298 from PX4/adafruiti2cpwm

pca9685: correct input scaling
navigator: correct mode for land and termination
Merge pull request #1299 from PX4/navigatorstatefix

navigator: correct mode for land and termination
sensors: remove warnx
Merge pull request #1300 from PX4/sensorswarnx

sensors: remove warnx
Enable TELEM2 MAVLink, forward local pos at 30 Hz if connected via USB
Be more permissive with mission component IDs, renamed camera to onboard link but still accepting same commandline syntax
Merge pull request #1297 from PX4/mission_fix

mavlink: missions manager compID cleanup
Merge branch 'master' of github.com:PX4/Firmware into indoor