- The temperature control is pretty much complete
  (not sure what to do w/ autotemp though)
  Changed the pins assignment to clearly separate bed and extruder heaters
  and temp sensors, changed a bit how termistor tables are handled.
- The steppers control is rudimentary
  (only chanages what pins it uses depending on the active_extruder var,
   but that's enough for switching extruder in the start.gcode in the
   the profiles)
- Tested only w/ RAMPS 1.4

Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin into Marlin_v1

Conflicts:
	Marlin/Marlin.pde
	Marlin/ultralcd.h