What's new: miscellaneous

• Include "gtkmm/something.h" instead of "gtk--/something.h"

• Methods and classes that are deprecated in GTK+ 2.0 are not wrapped in gtkmm 2.0

• The GDK wrappers are now auto-generated and are in the Gdk namespace.

• Default signal handlers previously suffixed with _impl. Now prefixed with on_ - for instance, Button::on_clicked().

• Namespaced enums.