update sphinx docgen
was missing context property attributes - context.mode for example. add RNA properties into context docs.

also minor updates
- exclude freestyle if its not enabled.
- add missing context member.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56388 954f8c5b-7b00-dc11-b283-0030488c597c