Fix 0.10 style caps

https://bugzilla.gnome.org/show_bug.cgi?id=732699
Simplify thumbnailing

Make use of gdkpixbufsink rather then own our convertion code.

https://bugzilla.gnome.org/show_bug.cgi?id=732700
clutter: don't hide cursor when stage was left.

Fixes : https://bugzilla.gnome.org/show_bug.cgi?id=710554