Fix Gen7 1.4 pinout

Gen7 1.4 uses very different pin assignments, might as well make a new
section and remove some of the conditionals from each. It's easier to change
your pin assingment this way if like me you don't wire it exactly to plan.
Added support for the Rambo reprap electronics board. Added Mcodes to set
motor current and microstepping pins.
first commit
Merge branch 'Marlin_v1' of https://github.com/Drakelive/Marlin
commit
fix max endstop pins
primo commit
Merge branch 'Marlin_v1' of https://github.com/Drakelive/Marlin
Union whit Erick version
Merge pull request #1 from johnnyr/patch-1

fix max endstop pins
Put bogus temp override back in Gen7 up to 1.3

Took out the ifdef when I split 1.4 out and forgot to permanently
define it for <=1.3.
Merge git://github.com/ErikZalm/Marlin into Marlin_v1
Add dummy Emergancy Pin to Gen7 1.4

Change required after pulling from ErikZalm.
Make serial port configurable.

This change makes the choice of serial port configurable so that
wireless capability can be easily added by connecting Bluetooth modules
(such as BlueSmirf or JY-MCU) to the expansion port pins.
Set default serial port back to 0.
Merge pull request #289 from buildrob/Marlin_v1

Marlin v1 configurable serial port
Merge pull request #284 from brackendawson/Marlin_v1

Use the right pins for Gen7 1.4
First cleanup. Moved all code to cpp files, so there are no dependencies on pde files. And no more odd requirement to cat files together. (Still need to fix the Makefile). Also cleaned up some defines and made defines upper case as by C coding conventions.
By mistake enabled the watchdog by default. This should be off by default.
Better explain the watchdog "problem" and rename the config define so it explains that the feature belongs to the watchdog.