Defines for electronics boards

Added boards.h which contains defines for all the board numbers, plus
some shorthand macros for less typing.
Clean up configs
Defines for electronics boards

Added boards.h which contains defines for all the board numbers, plus
some shorthand macros for less typing.
Clean up configs
Merge branch 'board_defines' of https://github.com/thinkyhead/Marlin into board_defines
Happy configs
Merge pull request #1195 from thinkyhead/board_defines

Defines for electronics boards
Very much preliminary configuration for SCOOVO X9H
Enable EEPROM and chitchat, of course
Update Configuration.h

2 changes for now
Merge branch 'scoovo_x9h' of https://github.com/thinkyhead/Marlin into scoovo_x9h

Conflicts:
	Marlin/Configuration.h