Blender Git Loki

Support for update callbacks in python defined RNA properties as discussed last meeting.
This means script authors can perform actions using these callbacks rather then on drawing which puts blender in a readonly state.

Simple example:

import bpy
def up_func(self, context):
print("test")

bpy.types.Scene.testprop = bpy.props.FloatProperty(update=up_func)
bpy.context.scene.testprop = 11

# prints -> test