Update git submodule reference for CSF.Core project

The location of the main CSF software utilities has changed (it is now named
CSF.Core and not csf-software-utilities).  Also the github organisation has
changed from "CSF-Software-Development" to "csf-dev".
Resolve #2 - add missing reference to System.Core assembly

This missing assembly reference meant that xbuild (and potentially other
compilers) could not build this project correctly.
Resolve #1 - Add the 'smart model binder' to the CSF.Web project

This is an ASP.NET MVC2 model binder based on the work at:
http://lostechies.com/jimmybogard/2009/03/18/a-better-model-binder/

There are still some issues with this, specifically a unit test that is
currently marked as ignored.  This can be improved at some point so that
multiple instances of the same model binder type are counted as duplicates
instead of being silently accepted.