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Update Python Server SDK docs to have a relay mode by default
changes default create_session to relayed, fixes #33
Update Python Server SDK docs to have a relay mode by default.
Docs correction.
Merge remote-tracking branch 'jeffswartz/jira/14491' into issue-33

Conflicts:
	opentok/opentok.py
adjusts archiving sample for mediaMode change
Merge branch 'aoberoi-issue-33'
Update to version 2.2.1
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Docs - new default setting for createSession()
revisions to readme file.