Refactor Symfony Serialization

To Support complex message graph the EnvelopeNormalizer must ask the
serializer to denormaliza as there can be other denormalizers. To
accomplish this a DefaultMessageNormalizer was created.

Also to have a more complete example of custom deserialization a Fixture
directory with a SendNewsletterMessage is added with custom metadata for
JMS Serializer (Annotations) and Symfony Serializer Component (CustomNormalizer).
pyrus instead of pecl for extensions
install ext is auto enabling
revert to pecl
better intro
use pyrus
enable php extension
5.5 isnt allowed to fail anymore
Merge pull request #37 from henrikbjorn/serializer

Refactor Symfony Serialization
Add forking example
Initial test push for forking
change visibility else it cant be called
Add real usage for forking and fix a few minor issues
fix naming
fix forking resolver test
I always forget the Test suffix
forking documentation
Merge branch 'forking' of github.com:henrikbjorn/Bernard into forking
remove obsolete test