Compilation bugfix for I2C beeper

Software does not compile when you define a beeper connect through I2C.
Merge pull request #80 from Jerome-PS/patch-1

Compilation bugfix for I2C beeper
starting to function
Merge remote-tracking branch 'repetier/master'
Added Melzi board, bug fixes
height tweak, fixed extuder steps per millimeter
Merge remote-tracking branch 'Repetier/master'

Conflicts:
	Repetier/Configuration.h
Merge remote-tracking branch 'origin/master'