First stab at gathering communication menu entries into one header

First stab at gathering communication menu entries into one header

  * Provide a new communicate.php page that links to the other
    pertinent modes of communication for browsers with JavaScript
    turned off
  * Provide a drop-down menu under the new "Communicate" heading
    that links to mailing lists, IRC, calendar, blog, and planet
  * Also group a few items under "Contribute" - including "Report bugs"
    and "Develop code" (links to the list of code repositories).
    There is a stubbed-out "Join committees" entry because we don't
    have a single page that lists all of the ongoing activities
    in the community.

git-svn-id: svn://svn.open-ils.org/ILS-Contrib/evergreen-ils.org@1069 6d9bc8c9-1ec2-4278-b937-99fde70a366f