[Bf-vfx] multi-spline working in mask rasterizer :)

[pete larabell]

Hey guys,

I added multi-spline support to the rasterizer for mask editor.

A linux64 build is here:

http://graphicall.org/927


Some screenshots are here:

http://www.pasteall.org/pic/31948
http://www.pasteall.org/pic/31949
http://www.pasteall.org/pic/31950

Sergey, I mailed to patch to you rather than post it on code review
since i wasn't sure if that codereview is ib use for gsoc branches...

Cheers!