Replace the <= to < in the Command M907, M350 and M351.
The for loop for Axis count over the Array.
Add a break after M907
If CORE_XY is in use X and Y Axis had to be activated at the same time
Merge pull request #466 from midopple/Marlin_v1

BUG Fix in Commands M907,M350 and M351
added support for the reprapworld keypad
changes:
- changed the variables from keypad to reprapworld_keypad
- added a missing ifdef check
Merge pull request #472 from gregor2005/Marlin_v1

added support for the reprapworld keypad