Merge pull request #210 from Dabble63/Marlin_v1

Add Duty Cycling to the Heater Bed
Merge pull request #208 from Enchiridion/Marlin_v1

Added support for dual Z axis stepper drivers
Merge pull request #195 from kobaan/Marlin_v1

Updated german translations in language.h
Updated Language.h with pause, resume, and retract
Added pause and retract lcd menu items
Fixed Retract in LCD Menu
no message
Enable M503 also when eeprom is disabled
Disable FAST_PWM by default. On some systems it does not work ok.
Do not use feedrate multiiply on Z and E only moves.
Update Marlin/language.h

Spanish language included. It features the LCD screen messages and a small part of the Serial messages.
Merge pull request #212 from elgambitero/Marlin_v1

Spanish language included in the language.h file
Set default language 1
Update Marlin/language.h
The pre-heat ABS and PLA options in the LCD Menu were broken a while back.  The pre-heat worked fine, but the cooling fans were not switching on as intended.  This is now fixed.
Fixes error introduced at commit aee475aa55f3a53428ed6b60bb8d6662046cd16c which caused the sketch not to comile for language option 1.  Several defines were removed but still referenced in ultralcd.pde
Merge pull request #217 from Justblair/Marlin_v1

Fixed broken Language file and pre-heat ABS and PLA options
fixed incorrect menu messages from last commit...

- removed several multiple definitions of same message
- fixed definition of missing messages in german and spanish
- tweaked german translation (a lot)
- added note about changing and testing this file
added KILL_PIN support / cleaned up manage_inactivity function definition
changed int to long to overcome overflow of number display

- related bug reports: Issue #201, Issue #213