Updated to working version of Session State and Output Cache

Session State provider has been improved to fix bug, as well as add
support for disabling session locking when desired. Output Cache is
updated to use our version of the provider which is fully tested and
running in production.
Fixed reference to Couchbase client in README.MD
Updates to allow for not disposing of clients, and to better santize output cache keys.
Fixed readme.md file
Merge pull request #1 from kendallb/master

My changes to be pulled in the master repository