Allow the user to configure the default max score value for short and long answer questions

+1 for committing this patch. But falcon is trying to limit the new features request as to make the quiz 7.x stable sooner, so i'm leaving this issue at his discretion.

Did a quick review of patch, I'm sure it needs work.

1. Two return?

   public function getMaximumScore() {
-    return 10;
+    return return variable_get('long_answer_default_max_score', 10);
   }

2. $form['#validate'] must be array string given. ($form['#validate'][] = 'long_answer_config_validate';)

 function long_answer_config() {
-  return FALSE;
+  $form['long_answer_default_max_score'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Default max score'),
+    '#description' => t('Choose the default maximum score for a long answer question.'),
+    '#default_value' => variable_get('long_answer_default_max_score', 10),
+  );
+  $form['#validate'] = 'long_answer_config_validate';
+  return $form;
+}

Since this is not a show stopper i committed this patch to git.