Merge pull request #14 from cmircea/master

Session provider improvements, removal of unimplemented code
Updating to RavenDB 2.0.2187
Always sync to interval, and allow for offset
Updated usage test

I was wrong in the comment.  The age would initially be negative, but
that would still fall into scope.
AddCascadeDeleteReference extension method added

http://stackoverflow.com/questions/14085983
OrderBy(string) extension methods added
Updating to RavenDB 2.0.2230