Updating the configuration_reference.md

In the resetting node this line must be removed 
handler:            fos_user.resetting.form.handler.default
the handler is not anymore used
Update Group.php
Merge pull request #1431 from Szymciosek/patch-1

Update Group.php
Merge pull request #1405 from sof1105/patch-1

Updating the configuration_reference.md
Added invalid message when passwords do not match
Update FOSUserBundle.sv.yml

Added "Bad credentials" translations for "sv"
Update user_manager.md

deprecated method
Merge pull request #1453 from allanbrault/patch-1

Update user_manager.md
Merge pull request #1444 from mathewrapid/master

Added invalid message when passwords do not match
Update FOSUserBundle.nl.yml
Merge pull request #1455 from rjbijl/dutch-translation

Update FOSUserBundle.nl.yml