Test if _format requirement is not already set before overwriting it
adding tests for PR#476
passing formats to the RestRouteLoaded in tests allows _format to be set
Fixing _format requirements made available to developers - comments
_format requirement - removed a useless comment part
_format default behavior documented with the possibility to override it
Fix doc for _format overriding
Revert "Ignore typehinted controller method arguments when generating routes"

This reverts commit ff9476992216b3edcb27830face659100ffaec89.
Merge pull request #476 from zefrog/allow-custom-format-requirements

Test if _format requirement is not already set before overwriting it
Merge pull request #478 from tystr/typehinted-controller-arg-route-fix

Revert the changes to how typehinted controller arguments are handled when using automatic route generation
Add fos_rest.serializer.serialize_null to control null value serialization

The JMS serializer by default will not serialize keys with a null value.
This new parameter allows control of this behavior via the FOSRestBundle
configuration in app/config/config.yml.
Setting fos_rest.serializer.serialize_null to true will cause the
setSerializeNull() method on the Context object to be called with the
value that is set in the configuration.
Add test case to check that the Context Object has its member
$serializeNull set to the correct value.
Add new parameter to the Resource/doc/configuration-reference.md
documentation file.
Merge pull request #480 from hglattergotz/iss_459

Add fos_rest.serializer.serialize_null to control null value serializati...
added serializer:serialize_null setting
Check Serializer against Interface, not Class
Merge pull request #481 from jsampedro77/use-serializer-interface

ViewHandler, check Serializer against Interface, not against concrete class
Added validation support to the request body converter
Update configuration and service definition
Updated documentation
Allow passing options to the validator