adds operations transformation package.
adds document, client and server to manage and apply transformations.
adds hub route channel. closures just look too ugly.
cleans htmod route method
adds revision method to ot server doc.
adds hub group control and interface.
adds basic integration for document collaboration.
adds publish doc command.
merges branch ot. adds collaborative editing backend using operational transformation.
client support will follow soon and the integration is not yet tested.