Window: Add ::is-maximized property

	* Wrap ::is-maximzed property
	* Wrap gtk_window_is_maximized() accessor method
Regenerated enums .defs.
Regenerated methods .defs.
Regenerate docs XML.
3.11.8
Container: Add a TODO comment about removing the virtual add().

See bug #724732.
Update .gitignore

* .gitignore: Ignore newly added generated classes in gtk/gtkmm.
Merge branch 'master' of git://git.gnome.org/gtkmm