(excluding files that are synced from another module) https://bugzilla.gnome.org/show_bug.cgi?id=660358
This basically: * Checks a11y configuration properties * Checks if clutter has a11y enabled * Loads atk-bridge It also ensure proper NO_GAIL and NO_AT_BRIDGE values on gnome-shell startup script https://bugzilla.gnome.org/show_bug.cgi?id=612599