Merge changes Ifc3b070f,Id285664b,I6d76d9b1,I4f4f013e,I366685ec, ...

* changes:
  sourcedr: Remove data_utils.py
  sourcedr: Extract Project class from server.py
  sourcedr: Rename preprocess.CodeSeach to ReviewDB
  sourcedr: Extract codesearch logic from preprocess
  sourcedr: Don't call expanduser() in CodeSearch
  sourcedr: Cleanup Python import statements