Description  
--------
This is a patch of Marlin by ErikZalm (https://github.com/ErikZalm/Marlin) that adds probing command (G30) with the functions developed by larsbrubaker (https://github.com/ErikZalm/Marlin/pull/323)

The changes made are hereby released on the public domain.

Quick Information  
===================
You must setup two endstops for the Z axis, the lower one is considered our "probe"  

Disclaimer
===================
This hardware/software is provided “as is," and you use the hardware/software at your own risk. Under nocircumstances shall Carlosgs be liable for direct, indirect, special, incidental, or consequential damages resulting from the use, misuse, or inability to use this hardware/software, even if Carlosgs has been advised of the possibility of such damages.