Apply PSR-2 of PHP Framework Interop Group (FIG)

As we did with ATK: https://github.com/atkphpframework/atk/pull/3
More info about the FIG: http://www.php-fig.org/
Merge pull request #16 from PhrozenByte/feature/php-fig-standards

Apply PSR-2 of PHP Framework Interop Group (FIG)