Commit for Ticket #505 - Make population of Filter Form dynamic

-In sidebar-group-archive.php made switch statements for departments and
semesters dynamic; these statements were populating the respective select
dropdown elements via alues in the url querystring, so this was easily
converted to a dynamic function

-For the population of the department select option fields, the ajax
function was moved from the bottom of the page to utility.js

-This function was also converted to take advantage of jQuery and
WordPress ajax tools; this allowed for moving the processing function from
includes/department_processing.php to the new lib/ajax-funcs.php

-Moving this function both takes advantage of the native WordPress ajax
system and allows for the processing function to use WP and theme
functions
Merge branch 'remed' of github.com:livinglab/openlab into remed