Added expired as a possible state of an archive
adds tests for expired archive status
mock fixture for tests of expired archive status
adds test for unknown archive properties
Docs edits:

- new 'expired' archive status
- support for Windows Azure as an upload target
Merge pull request #3 from jeffswartz/issue-61

Docs edits
Docs edits - peer-to-peer sessions are now known as sessions with the media mode set to relayed.
Merge pull request #4 from jeffswartz/issue-61

Docs edits - peer-to-peer sessions are now known as sessions with the me...
Merge branch 'aoberoi-issue-61'