gae_memcache.clear(), thanks Matt

VERSION

@@ -1 +1 @@
-Version 2.0.9 (2012-09-14 16:08:21) stable
+Version 2.0.9 (2012-09-14 21:16:55) stable

gluon/contrib/gae_memcache.py

@@ -47,10 +47,12 @@ class MemcacheClient(Client):
         self.set((time.time(), value))
         return value
 
-    def clear(self, key):
+    def clear(self, key = None):
+        if key:
             key = '%s/%s' % (self.request.application, key)
             self.delete(key)
-
+        else:
+            self.flush_all()