fix homing for deltas

Conflicts:
	Marlin/Configuration.h
	README.md

Conflicts:
	Marlin/Configuration.h
	Marlin/language.h
	Marlin/pins.h

Conflicts:
	Marlin/Configuration.h
	Marlin/Configuration_adv.h
	Marlin/Marlin.h
	Marlin/Marlin_main.cpp
	Marlin/Servo.cpp
	Marlin/language.h
	Marlin/pins.h
	Marlin/planner.cpp
	Marlin/ultralcd_implementation_hitachi_HD44780.h
	README.md

 Fix home_all_axis to make QUICK_HOME work with Repetier-Host which sends G28 X0 Y0 Z0 instead of G28. Thanks to Matt Schoenholz for reporting this issue.

(Thanks iquizzle)

Conflicts:
	Marlin/Configuration.h
	Marlin/Marlin_main.cpp
	Marlin/pins.h

Support for Elefu RA Board

This should fix issues with pull request 467, I hope.

Conflicts:
	Marlin/Configuration.h
	Marlin/Marlin.pde
	Marlin/ultralcd_implementation_hitachi_HD44780.h

Servo Enstops working!

Diffed and merged, preserving my updates

Integrated fixes from henrikbrixandersen pull request #504

Added servo actuated enstop coding to allow G28 command to engage and retract a servo to specified angles.

faster GLCD (ST7920 SW-SPI) implementation / fixes

- fixed long menu entries (>14 or >18 chars) caused overrun in dogm lcd
implementation
- fixed pin set problem when in interrupt
- much faster ST7920 SW-SPI implementation
- increased ST7920 framebuffer size for more speed

Added support for Megatronics v2.0 and Minitronics v1.0

Fix: Long menu entries (>14 or >18 chars) caused overrun in hitachi display implementation