removed unnecessary variable
fix PSR-2 + PSR-1 + PSR-0
removed dangerous and misleading Model::reset()
updated tests to stop relying Model::reset
Class to manage collections of models
fix PSR-2 + PSR-1 + PSR-0
Update Collection.php

Update method filter
Merge pull request #7 from beneditocarlos/desenv

introduced model collection
100% test coverage
update method validateFields, using export array
Update Validation redmodel:
 - renamed class;
 - new tests for Class;
 - new behavior to validate.
fix PSR-2 + PSR-1 + PSR-0
Merge pull request #8 from beneditocarlos/validation

refactored validation
Merge pull request #9 from marcioAlmada/desenv

Improved validation code base and code styles fixes