Bringing back old I2C code, just temporary workaround
First round of testing successful - back to I2C code from Dec / Nov 2012
Merge pull request #168 from PX4/i2c_workaround

I2C driver workaround for NuttX
scripts: added APM startup script
rc.standalone: start APM if available
register rc.APM script
px4: enable APPS_BINDIR support

useful for APM startup script
stdio: added vdprintf() for printf to a file descriptor
rc.APM: update to support PX4IO board
px4io: fixed non-test usage of servos

we need to advertise the armed flags, and disable lockdown on arming
px4io: removed gratuitous printf
rc.APM: support px4io board