Fix typo in _create_or_get_missing_hashes call
[kamaki] / docs /
2012-04-19 Constantinos Venet... Change contact email in docs/overview.rst
2012-04-19 Giorgos VerigakisSmall update to docs
2011-11-29 Giorgos VerigakisAdd documentation material from old wiki
2011-11-29 Giorgos VerigakisAdd some basic documentation