Blender Git Loki

Patch [#23389] Add authorship information to exported COLLADA files
Contributed by Imran Syed (freakabcd).

This adds basic authoring tool and author info ("Blender User" for now).

NOTE: Linux and OSX users need now to update their OpenCOLLADA libs - Blender should now compile fine with their latest revision.

Made some changes to the original patch to ensure linking is done correctly.
Some small cleanups for scons too.