add eps support to rsvg-convert

Added support for exporting to Encapsulated PostScript files using rsvg-convert

Bug #707526.
css: Fix parsing of #rrggbb values

Fallout from commit 30991cd1299da9b81f2f3c176a38b10f992b2aaf.

https://bugzilla.gnome.org/show_bug.cgi?id=709931