Flows no longer need to be saved between uses.

Also introduces util.positional declarations.

Reviewed in http://codereview.appspot.com/6441056/.

Fixes issue #136.
diff --git a/samples/plus/plus.py b/samples/plus/plus.py
index 6b9dbf0..c6089f9 100644
--- a/samples/plus/plus.py
+++ b/samples/plus/plus.py
@@ -113,7 +113,7 @@
   service = build("plus", "v1", http=http)
 
   try:
-    person = service.people().get(userId='me').execute(http)
+    person = service.people().get(userId='me').execute(http=http)
 
     print "Got your ID: %s" % person['displayName']
     print