- Added some SearchRequest attributes ; now it's even simpler to add searchable fields

- Began decoupling of QueryBuilder from native MySQL method ; some works needs to be done on for the Repository object splitting also.

src/Query/Join.php

@@ -2,7 +2,7 @@
 
 namespace Ulmus\Query;
 
-use Ulmus\QueryBuilder;
+use Ulmus\MysqlQueryBuilder;
 use Ulmus\Repository\ConditionTrait;
 
 class Join extends Fragment