fix DEFAULT_AXIS_STEPS_PER_UNIT minor Z rounding error
Merge pull request #459 from martinxyz/fix-rounding-error

fix DEFAULT_AXIS_STEPS_PER_UNIT minor Z rounding error
Solved minor bug in controllerFan()

Extruder 2 was checked where extruder 1 should be checked.
Merge pull request #464 from arnoudja/Marlin_v1

Solved minor bug in controllerFan()