solidAngle Maya to Arnold 0.21

Description: installers for MtoA 0.21, win64bit maya 2012/13/13.5 (2013 ext) and updated documentation(linux/macOs 64bit intsllers are included however the patch only works for win64 to my knowledge)?

tested and working fine with the x-force keygen of 0.19 (which is included) from this release, I left the original .nfo untouched

kudos to x-force_________________________HIGHLIGHTED NEW FEATURES?

Holdout Matte support in Standard Shader. See details.Color Temperature check added to lights. The default color is set to 6500 (6500K is considered as the white point by CIE).Implemented a proper Imageplane shader for the Camera.Improved aiImage template.