[actuators] sorry, fix actuators compilation
[i2c] replace convenience macros with functions
I2CTransmit(dev, trans, addr, len) -> i2c_transmit(&dev, &trans, addr, len)
I2CReceive(dev, trans, addr, len) -> i2c_receive(&dev, &trans, addr, len)
I2CTransceive(dev, trans, addr, len_w, len_r) -> i2c_transmit(&dev, &trans, addr, len_w, len_r)
Merge pull request #387 from flixr/i2c_convenience_functions

[i2c] replace convenience macros with functions