Added nearly full support for GtkStatusIcon (minus the GtkMenu popping)
Add gtk_menu_item_set_label
Added wrapper for gtk_clipboard_wait_for_text
Add PixbufNewFromFile and Pixbuf.RotateSimple.
Add wrapper GetSelectedRows for gtk_tree_selection_get_selected_rows

Some extran comments and code cleanup by @jrick.
Merge remote-tracking branch 'parent/master'