Add a Factory::getHydrator that instanciates the result of getHydratorClass

[docteurklein]

So that the factory is a real one :)

[Ocramius]

@docteurklein PR? :D

[docteurklein]

I should have done that, right :)

Unfortunalty, I just found out that I don't need an hydrator at the moment, so I'm not going to find time for it.

Technically, are we sure that an hydrator is always instanciable without ctor arguments?

[Ocramius]

@docteurklein yes, that's ensured by the factory:

GeneratedHydrator/src/GeneratedHydrator/CodeGenerator/Visitor/HydratorMethodsVisitor.php

Line 63 in 4eb3f2e

$this->replaceConstructor($this->findOrCreateMethod($node, '__construct'));

It is a good suggestion btw, and it would simplify consumption of the library.

I'm not sure why I didn't implement it this way upfront, but I'll think about it: a reason is there for sure.

[docteurklein]

otherwise, great work! I'm amazed by the usage of php-parser :)