CC-2966: Remove minimum and maximum logo sizes - make them recommended instead

Fixed by:
1. change wording
2. attach custom filter to the logo upload form, the filter scales down the image
if it's larger than 600x600

airtime_mvc/application/forms/SupportSettings.php

@@ -1,5 +1,7 @@
 <?php
 
+require_once 'customfilters/ImageSize.php';
+
 class Application_Form_SupportSettings extends Zend_Form
 {
 
@@ -99,12 +101,8 @@ class Application_Form_SupportSettings extends Zend_Form
 				->setRequired(false)
 				->setDecorators(array('File'))
 				->addValidator('Count', false, 1)
-				->addValidator('Extension', false, 'jpg,png,gif')
-				->addValidator('ImageSize', false, array(
-					'minwidth'	=> 200,
-					'minheight'	=> 200,
-					'maxwidth'	=> 600,
-					'maxheight'	=>	600));
+				->addValidator('Extension', false, 'jpg,jpeg,png,gif')
+				->addFilter('ImageSize');
 		$upload->setAttrib('accept', 'image/jpeg,image/gif,image/png,image/jpg');
 		$this->addElement($upload);