Implementation of ArraySimpleSerializable

I have implemented new Hydrator like ArraySerializable. However this version should be fast by remove all dependences (but also features) and set it as shared. I use it in Apigility and performance results is quite good.
May also want a unit test. Also: why not using [`GeneratedHydrator`](https://github.com/Ocramius/GeneratedHydrator) instead? (shameless plug)