Removed JS includes from footer.html. From now on JS includes will put in a seperate...

Removed JS includes from footer.html. From now on JS includes will put in a seperate file residing at /server/2015/

This change was done because each page will have different JS
requirement.

All pages, from now on:

- Will have to include an additional /server/2015/close.html file that
closes the HTML document.

- There will be three SSI includes at the end of each HTML document.

  <!--#include virtual="/2015/footer.html"-->
  <!--#include virtual="/server/2015/pagename_js.html"-->
  <!--#include virtual="/server/2015/close.html" -->

where `/server/2015/pagename_js.html' is a file containing the JS
includes for a page at /2015/pagename/. For instance, the 'call for
sessions' page will have a /server/2015/cfs_js.html file containing
the JS includes for that page.