Hook up get_from_file_name

sugar/objects/__init__.py

@@ -1,2 +1 @@
-
-
+from sugar.objects import mime

sugar/objects/mime.py

@@ -1,4 +1,8 @@
-from sugar import _sugarext
-
-def get_from_filename(filename):
-    return _sugarext.get_mime_type_from_filename(filename)
+try:
+    from sugar import _sugarext
+except ImportError:
+    from sugar import ltihooks
+    from sugar import _sugarext
+    
+def get_from_file_name(file_name):
+    return _sugarext.get_mime_type_from_file_name(file_name)