Allow getting params the same way data() works

I could improve this to do the `hash::insert()` to replace `addParams()` as is done in `data()`

lib/Cake/Network/CakeRequest.php

@@ -875,7 +875,7 @@ public function data($name) {
  */
 	public function param($name) {
 		if (!isset($this->params[$name])) {
-			return false;
+			return Hash::get($this->params, $name);
 		}
 		return $this->params[$name];
 	}