Fix: InputFilters should reside in a designated namespace

Not sure how you feel about this, but just as someone decided that forms extending `Zend\Form` should reside in the `ZfcUser\Form` namespace, it would be just as consistent to move input filters into `ZfcUser\InputFilter`.

On a separate note: it seems that the autoloader class map has not been updated in a while (48 additions vs 40 deletions).