Initial i2c support
Now sending the current altitude via i2c (as a float).
Defined the frame sent on the i2c interface.
Added gyro to the i2c frame, fixed uint bug.
Timestamp for sonar data added to i2c frame.
Gyro range field in the i2c frame.
Gyro range.
Fixed formatting issues.
Merge pull request #3 from tcptomato/master

I2C