Remove ability to use arbitrary view templates paths.

View templates should only be loadable from within the configured
template paths. Allowing any file path causes issues when users can
define the template to be loaded.

cake/libs/view/view.php

@@ -857,9 +857,6 @@ function _getViewFileName($name = null) {
 			$name = $this->viewPath . DS . $subDir . Inflector::underscore($name);
 		} elseif (strpos($name, DS) !== false) {
 			if ($name{0} === DS || $name{1} === ':') {
-				if (is_file($name)) {
-					return $name;
-				}
 				$name = trim($name, DS);
 			} else if ($name[0] === '.') {
 				$name = substr($name, 3);