Added support for JMSSerializer MaxDepth exclusion strategy
Fixed doccoments
Added documentation about enabling the MaxDepth exclusion strategy
Fixed small merge leftover
added test for JMSSerializer MaxDepth exclusion strategy support
Merge pull request #523 from fieg/serializer-max-depth

Added support for JMSSerializer MaxDepth exclusion strategy
Catched the Symfony exception in the XmlDecoder

The body decoders should return null when they cannot decode the
body, not throw an exception. This fixes the behavior change after
the switch to the Serializer component code.
added note about rest edition