cleanup new HTTP apiendpoints, added HTTPHelper and getStartEndFromRequest and updated all controllers that called their own versions of this function

airtime_mvc/application/common/HTTPHelper.php

@@ -0,0 +1,20 @@
+<?php
+
+class Application_Common_HTTPHelper
+{
+    /**
+     * Returns start and end DateTime vars from given 
+     * HTTP Request object
+     *
+     * @param Request
+     * @return array(start DateTime, end DateTime)
+     */
+    public static function getStartEndFromRequest($request)
+    {
+        return Application_Common_DateHelper::getStartEnd(
+            $request->getParam("start", null),
+            $request->getParam("end", null),
+            $request->getParam("timezone", null)
+        );
+    }
+}