replace hardcoded ucommrasmussen with the dynamic site url

plugins/cas_auth_unl/actions/login.php

@@ -34,9 +34,10 @@
         if ($usecas == 'yes') {
 			$casObject = new elggSimpleCas();
 			if (!$casObject->checkCas()) {
+				global $CONFIG;
 				$ts = time();
 				$token = generate_action_token($ts); 
-		        SimpleCAS::setURL('http://ucommrasmussen.unl.edu/workspace/UNL_Elgg/elgg/action/login?usecas=yes&__elgg_ts='.$ts.'&__elgg_token='.$token);
+		        SimpleCAS::setURL($CONFIG->url.'action/login?usecas=yes&__elgg_ts='.$ts.'&__elgg_token='.$token);
         		$casObject->forceCas();
 			} else {
 				$cas_user = $casObject->getUserCas();