Added support for Gnome's gio

Instead of using our own Freedesktop's trash implementation,
use gio when it's available.

send2trash/plat_gio.py

@@ -0,0 +1,14 @@
+# Copyright 2013 Hardcoded Software (http://www.hardcoded.net)
+
+# This software is licensed under the "BSD" License as described in the "LICENSE" file, 
+# which should be included with this package. The terms are also available at 
+# http://www.hardcoded.net/licenses/bsd_license
+
+from gi.repository import GObject, Gio
+
+def send2trash(path):
+    try:
+        f = Gio.File.new_for_path(path)
+        f.trash(cancellable=None)
+    except GObject.GError as e:
+        raise OSError(e.message)