Revert "Updated to support the old Master/Slave data store. The new High Replication"

This reverts commit 6762952e58e94c81b8d3a7ff27554183a06c6040.
Add support for the High Replication data store

Use ancestor queries and a common singleton entity for all Score
instances to avoid consistency issues with the High Replication data
store.

See
https://developers.google.com/appengine/docs/python/datastore/structurin
g_for_strong_consistency for more info
Style cleanups
Merge pull request #2 from ickard/master

High Replication data store support