Pre-Release v0.8

The Rigify retarget has received a lot of love and it no longer requires the need for users to select presets for characters, the retargetting is now completely inperceptible. Additionally full undo/redo support has been added for every operation so there shouldn't be problems regarding RNA stuff being missing, or doing say, a create operation, going back and the plugin not allowing you to create again essentially locking you out until you reselect the armature. Constraint symmetry offset is now an option for armatures whose pairs are on slightly different locations (Like Francis' armature). And lastly, a bunch of code cleanup, namely eliminating any last remains of the Simple IK operator