use http for pdfs

Author: Joel Day

ConvertAPI/Pdf2PowerPoint.php

@@ -12,7 +12,7 @@
   */
 class Pdf2PowerPoint extends Abstract2PowerPoint {
 
-    protected $_https = true;
+    protected $_https = false;
 
  /**
   * URL of the appropriate convertapi.com API.
@@ -25,4 +25,4 @@ class Pdf2PowerPoint extends Abstract2PowerPoint {
   */
 	protected $_validInputFormats = array('pdf', 'pdfa');
 
-}
+}