site templates move

Ok - have done the following:

moved site specific files to 

main/site_templates/Stanford etc

Please note that this doesn't remove all necessity for having tests in code for different sites - I didn't want to copy files that we would have to maintain if there were any changes made to them like base.html for example. Although here we could inherit specific changes for site thing but a bit over the top

added site specific directories for graphics and css - this makes the separation of these a bit better. 

Email: added code to fix site stuff there to avoid hard coding email addresses.

Let me know if you want me to change anything etc