Added additional example
More sensible error handling in calibration
Merge branch 'master' of github.com:PX4/Firmware
Adjusted stack size for commander app
Switched I2C to interrupt driven mode
Merge branch 'master' of github.com:PX4/Firmware into px4io-i2c
Switched to debug statement which is more efficient regarding stack usage, only printing at debug level 2 or higher.
Merge pull request #203 from PX4/debug_example

Added additional debug / uORB example
Merge remote-tracking branch 'upstream/master' into px4io-i2c
corrected some wrong units (used in airspeed calculation)
Hotfix: Add support for 9-channel Spektrum/DSM setups.

Tested by Felipe Reis <felipereis87@gmail.com>
Out of memory warning, flash and RAM optimizations
Merge branch 'master' of github.com:PX4/Firmware into px4io-i2c
Disabled MAVLink debug app
Kill off a couple of files that should never have been checked in.
Simplify the PX4IO main loop to cut down on memory consumption.
Don't try to print the idle stack usage (we need to fix it up before the code can be adapted to measure it).
more fixes for the airspeed readout
Hotfix: discard NUL characters in readline, rather than faking EOF on the console.
Hotfix: discard NUL characters in readline, rather than faking EOF on the console.