Merge pull request #3 from Azdle/master

Several Updates to PyOneP
Provisioning library and example updates and fixes
0.7.2 pypi release
Support python 2.6 and restore exception messages
0.7.3
Emphasize direct access using onep module, rather than datastore
Restored python 2.5 support
0.7.4
Removed redundant comment
Updated python support note
Show pip install method
Added doc link
Added 0.3 migration information
writegroup() does not take any options