endstop change without homing testing
Update to allow endstop adjustments without homing
Merge pull request #3 from RichCattell/Testing

Testing
Add incremental build height adjustment
Autocal and M666 updates
New Prerelease version

Completely re-written autocalibration code (still needs some
optimization).
Lots of other updates ;-)
update pins.h
No interest in working on the old master code

Merge branch 'development' of github.com:conicalflask/Marlin