[WIP] User VarDumper component as DataFormatter

Use the VarDumper component instead of the kintLite method. This could be merged when 2.6 stable is tagged. https://github.com/symfony/var-dumper doesn't require any other dependancies, so should also work on non-symfony projects and < 2.6.x

Pros:
 - More stable
 - More flexible
 - Can be extended with more casters etc. (not really sure how yet)
 - Less verbose

Cons:
 - Extra dependancy
 - Defines `dump()` method.

(Of course the @dev can be removed once stable is tagged)