E3D v6 DaVinci 1.0A Mount

Modification of the lower mount from http://www.thingiverse.com/thing:707530 to account for extrusion idler mount thickness in upper right corner. See photos for a better explanation, the black lower mount is from thing:707530, the blue lower mount is the redesign. Also adjusted mount hole pattern dimensions, original may have accounted for shrinkage that I do not see. Slight modification of Z thickness to provide better clamping force of E3D v6 since the original reqired sanding before making c