add expired state to archive representation, fixes #16
Docs corrections:

- New OpenTokSDK.ArchiveStatus EXPIRED value.
- Support for Windows Azure containers for uploading archive files.
New generated reference docs.
Merge pull request #1 from jeffswartz/issue-16

Docs edits
Merge branch 'aoberoi-issue-16'
Merge remote-tracking branch 'origin/master'

Conflicts:
	OpenTokTest/OpenTokTest.cs