Update Resources/config/routing.xml

I did it because Symfony2.1 load fos_message_thread_view in priority of the other path when we try to delete a thread. With this modification, the path fos_message_thread_delete works because the routing service load it before. It was conflictual because this two paths begins with same text.
Thread::getMessages() returns ArrayCollection instead of array
Fix Thread::getMessages() return type
Removed gratuitous paragraph

Namespaces are handled by composer; also registerNamespaces() is not available in symfony 2.1 any more
Fixed Doctrine\Common\Annotations\AnnotationException

The error was:
  [Semantical Error] The annotation "@Doctrine\ORM\Mapping\generatedValue" in property Acme\Message  
  Bundle\Entity\Message::$id does not exist, or could not be auto-loaded.
Merge pull request #158 from fogs/master

Documentation fixes
Merge pull request #80 from remontees/patch-1

Order of paths in Resources/config/routing.xml
Merge pull request #120 from EmmanuelVella/get-messages

Thread::getMessages() returns a Collection instead of array
Update index.rst
Update README.md
Add deleted threads list