Major performance improvements to the Dashboard and Calendar views

* Close the PHP session for writing as early as possible in most AJAX
  calls for those views
* Reduce the number of roundtrips to the server in both the Dashboard
  and Calendar views by putting the data in our HTML response (this
  makes a massive difference)
* Eliminated a couple of unneccessary AJAX calls
* Use lazy loading in full calendar
* Fixed a bug in the week view that only occurs near the end of the
  week (date->gmdate bug!)

airtime_mvc/public/js/airtime/dashboard/dashboard.js

@@ -395,7 +395,6 @@ function getScheduleFromServer(){
                 parseSourceStatus(data.source_status);
                 parseSwitchStatus(data.switch_status);
                 showName = data.show_name;
-                setTimeout(getScheduleFromServer, serverUpdateInterval);
           }, error:function(jqXHR, textStatus, errorThrown){}});
 }
 
@@ -456,8 +455,9 @@ var stream_window = null;
 
 function init() {
     //begin producer "thread"
-    getScheduleFromServer();
-    
+    //getScheduleFromServer();
+    setInterval(getScheduleFromServer, serverUpdateInterval);
+
     //begin consumer "thread"
     secondsTimer();