Remove silly `doctrine.$something.{$this->something}` pattern from factories

[Ocramius]

The pattern in the subject currently makes it hard for the end user to provide own factories. It can still live as a sane default, but should be instead a fallback logic

[superdweebie]

After playing with the code some more, I agree with this wholeheartedly. Not quite sure how to go about it myself though.

[Ocramius]

Seems like keeping the pattern doctrine.$something.$name will actually help us. We can define an abstract factory and solve the problems related to our multi-entity-manager-problems in no-time this way:

<?php

use Zend\ServiceManager\AbstractFactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class SuperDuperDoctrineFactory implements Zend\ServiceManager\AbstractFactoryInterface
{
    public function canCreateServiceWithName(ServiceLocatorInterface $sl, $name, $requestedName)
    {
        // @todo this is over-simplified obviously
        return 0 === strpos('doctrine.', $requestedName);
    }

    public function createServiceWithName(ServiceLocatorInterface $sl, $name, $requestedName)
    {
        // @todo pseudo-code
        $service = match('doctrine.<$serviceType>.<$serviceName>', $requestedName);
        $factory = $this->getFactory($serviceType, $serviceName);

        return $factory->createService($sl);
    }
}

Thoughts?

[superdweebie]

I've got this up and running locally in tandem with DoctrineMongoODMModule. Works well. All tests pass without any changes to the test suite at all. I'll make a few more tweaks and then put in a PR (although I'm offline for a little while, probably won't get to it for just over a week.).

[Ocramius]

Handled in #226