Clean up authorization in the backend. Fix groups.
Add API calls to purge container/object history.
Merge branch 'master' of https://code.grnet.gr/git/pithos
Ignore the Accept header.
Conflicts: pithos/api/tests.py
Object create via POST, when Content-Type is 'multipart/form-data'.
extend api object write to accept xml formatted requests containing hashmap information instead of actual data
socket_read_iterator raises BadRequest if maximum size is reached
Add initial admin guide skeleton
Object truncate.
Option to update an object using another object's data.
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