Sparky: check in assembly page
Merge pull request #1186 from peabody124/sparky_assembly

Sparky: check in assembly page
Initial support for Draco board in GCS

This is basicaly just copy of quanton and will be modified!
target draco: first bootable version

It lives and communicates with GCS and has functional bootloader. A lof of work still needed.
MPU9250: first version of driver

Without magnetometer. Gyros & accels works.
MPU9250: magnetometer support

It looks like it's working well
Fixed RTC clock divider value
MPU9250: polish driver and move common register defs to mpu60x0.h
MPU9250: pios_mpu9250.c renamed to pios_mpu9250_spi.c
fix whitespaces
draco: added support for onboard OSD