gtk+-3.0: Update to 3.9.10
gtk+-2.0: Update to 2.24.20
gdk-2.0: Update to 2.24.20
Release 0.21.1
Make add_tick_callback callback owned
gtk+-3.0: add gtk_list_box_prepend
codegen: Fix connect/disconnect of dynamic signals

Make dynamic wrapper function return handler id for later
disconnect.

https://bugzilla.gnome.org/show_bug.cgi?id=705461
gdk-3.0, gtk+-3.0: Update to 3.9.11+
vapi: Update GIDL/GIR binding lists
gio-unix-2.0: Update to 2.37.5
gstreamer-1.0: Update to 1.0.9
gdk-3.0, gtk+-3.0: Update to 3.9.11++
gdk-x11-3.0, gtk+-3.0: Update to 3.9.12
libwnck-3.0: Update to 3.4.7
atk: Update to 2.9.4