Blender Git Loki

Merge branch 'master' into temp_facegroups

Added face map UI, operators and RNA defines

Added as in - copy & paste from Antony's work in wiggly-widgets ;)

Add BF to contributors list

Let's not ask for legal trouble ;)

Copy BKE_facemap stuff from wiggly-widgets branch

Idea is to split face maps of from wiggly-widgets into this branch to prepare review/merge.
Used term "facegroup" for file names since I plan to rename "face maps" to "face groups" anyway.