updating Opentok.framework to v1.4.1
bumping version to 0.2.2-alpha2
fixes [ComTokboxTiOpentokSessionProxy disconnect] threading issues, moar logging
lets JS treat a session as reusable
version 0.2.2-beta1
Merge branch 'master' into dev
more details on SDK update
adds OTSessionError and OTSubscriberError enums fixes #29
reformats CHANGES document to markdown and renames to CHANGELOG.md fixes #19
Merge pull request #35 from opentok/dev

prepares for release 0.2.2