Base definition of the configuration tree.
New CrudException class.
The createForm method of the CrudBuilder class is implemented.
New configuration key "repository".

The key "form_type_namespace" is now required.
"find" method of CrudBuilder class implemented.
"insert" method of CrudBuilder class implemented.
"update" method of CrudBuilder class implemented.
"delete" method of CrudBuilder class implemented.
"getRepository" method of CrudBuilder class implemented.
Fix bad class for the form type factory.
The entity configuration was not passed to the CrudBuilder.
Adding the missing setRepository method in the CrudBuilderInterface
Factories tested.
Fix missing PHPDoc
New method "saveForm"
New method "getCurrentForm"
Method "getCurrentForm" added in the builder interface.
The method "saveForm" can now accept an existing entity.
The method "saveForm" now uses the internal persist method.
The current entity instance can now be retrieved from the crud builder.