Work around for dev_appserver not supporting force_writes.
Work around for dev_appserver not supporting force_writes.

Fixes issue 80



git-svn-id: 120402244b5714bfc5c7f1741d57d585f71ae04f@137 441dd3cb-e453-d85f-364a-b28e0c74875c

OsoTech/appengine-mapreduce,OsoTech/appengine-mapreduce,johnwlockwood/appengine-mapreduce,mikea/appengine-mapreduce,OsoTech/appengine-mapreduce,johnwlockwood/appengine-mapreduce,mikea/appengine-mapreduce,johnwlockwood/appengine-mapreduce,OsoTech/appengine-mapreduce,johnwlockwood/appengine-mapreduce,mikea/appengine-mapreduce,mikea/appengine-mapreduce