fixed short invoice calculator (#114)

* fixed money display and address field for InvoiceTemplate entity
* added quick start button for users without active records
* rearranged columns on project and customer admin page
* improved extensions docu

src/Twig/Extensions.php

@@ -121,7 +121,7 @@ class Extensions extends \Twig_Extension
      */
     public function money($amount, $currency = null)
     {
-        $result = round($amount, 2);
+        $result = number_format(round($amount, 2), 2);
         if ($currency !== null) {
             $result .= ' ' . Intl::getCurrencyBundle()->getCurrencySymbol($currency);
         }