Added Megatronics 3 support
Fixed Megatronics 3 pins
Disable motors on startup for inverted enable signals.
Moved sd pin config for due, Minitronics support, Azteeg X1 support
Merge branch 'master' into work092

Conflicts:
	src/ArduinoAVR/Repetier/SDCard.cpp
	src/ArduinoDUE/Repetier/SDCard.cpp