changed getErrors() to errors()

I'm simply taking a hint from the validator class. This is way more like the rest of laravel.

From validator:

/**
	 * An alternative more semantic shortcut to the message container.
 *
 * @return Illuminate\Support\MessageBag
 */
public function errors()
{
	return $this->messages;
}

Signed-off-by: Andreas Heiberg <git@andreas-heiberg.com>

src/LaravelBook/Ardent/Ardent.php

@@ -280,7 +280,7 @@ protected function performSave() {
      *
      * @return Illuminate\Support\MessageBag
      */
-    public function getErrors() {
+    public function errors() {
         return $this->validationErrors;
     }