Extend original base class so old methods work.

Sadly the fact that redirect_url is part of the interface isn't documented as
such in the interface :-(

emas/mobiletheme/redirector.py

@@ -1,8 +1,6 @@
-class Redirector(object):
-    def __init__(self, context, request):
-        self.context = context
-        self.request = request
+from gomobile.mobile.redirector import Redirector as BaseRedirector
 
+class Redirector(BaseRedirector):
     def intercept(self):
         """ We never redirect. """
         return False