Merge pull request #354 from sylvaindeloux/master

Added missing method
Updated login/register layout

* Refactored ``SonataUserBundle:Security:login.html.twig`` template to add twig blocks and change layout.
* Added a registration form handling solution (configuration has changed as well but default values are present).
Merge pull request #355 from Bladrak/loginDesign

Updated login/register layout
Fixed MopaBootstrapBundle dependency (now optional)
Merge pull request #358 from Bladrak/fixMopaDep

Fixed MopaBootstrapBundle dependency (now optional)
Updated documentation
Merge pull request #359 from Bladrak/doc

Updated documentation
Fixed PHP duplicate interface method