Bump jQuery requirement to 1.6

This is required for use of prop() function

Author: dregad

Snippets/Snippets.php

@@ -16,7 +16,7 @@ public function register() {
 
 		$this->requires = array(
 			"MantisCore" => "1.2.0, < 1.3",
-			"jQuery" => "1.3",
+			"jQuery" => "1.6",
 		);
 
 		$this->author = "John Reese and MantisBT Team";