WebSubmit: amends uninstall-jquery-plugins

* Amends libraries that are added in the installation process in the
  uninstall-jquery-plugins section of the Makefile, so they can be
  easily removed
WebSubmit: Author autocompletion upgrade script

* Adds an upgrade script to set up autocompletion for authors for the
  DEMOTHE submission using the demosite's 'People' collection as the
  source for authors