Added CUSTOM_MENDEL_NAME option to Configuration.h and language.h

Also cosmetic comment changes and spelling corrections in printed
messages
Make M303 silent when "S0" is sent

If S is left out perhaps it should be silent, but check the spec for
this M code.
Support for 10 level deep SD folder hierarchy
Adding servo documentation
Apply all changes from latest Marlin_V1

Diffed and merged, preserving my updates
Update Configuration.h
Update pins.h
Update language.h
Update Configuration.h
Update Configuration.h
Update pins.h
Make the beep tone less offensive
Removed "awaiting translation" for french
Allow increasing the software PWM frequency.
Moved corexy implementation from stepper to planner
(Thanks iquizzle)
Merge branch 'deltabot' into Marlin_v1
Spanish updated so far.
Merge branch 'Marlin_v1' into thinkyhead

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

Conflicts:
	Marlin/Configuration.h
	Marlin/language.h
	Marlin/pins.h
Merge branch 'Marlin_v1' of https://github.com/codexmas/Marlin into codexmas-Marlin_v1

Conflicts:
	Marlin/Configuration.h
	README.md