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'