Add ClassResourceSerializationGroupsTrait that looks at classname

Lesser code required to create different serialization groups, as they are based on the classname
Add ClassResourceRoutingTrait as faster alternative to DefaultRoutingTrait

The new routing trait will usually match the route name generated by the FOSRestBundle,
but it may break in certain configurations (like with prefixes)
Reformat documentation on Pagination traits to match the other sections
Add a simple cache to DefaultRoutingTrait
Merge branch 'feature/extra-traits' into develop

* feature/extra-traits:
  Reformat documentation on Pagination traits to match the other sections
  Add ClassResourceRoutingTrait as faster alternative to DefaultRoutingTrait
  Add ClassResourceSerializationGroupsTrait that looks at classname