wout/svg.js — pull request #132 by rap-kasta (2014-01-18 14:05:10+00:00)
Title: SVG.Doc _defs.parent linked to Doc & related specs

Without linking parent, we can not do complex things like:
* creating mask on the mask (draw.mask().mask())
* drawing on container like on the main canvas with access to global
defs (draw.group().mask())