Adopt PSR-2

Ideally this package should be formatted so that it adheres to PSR-2 syntax. This would give the benefit of having a uniform look/feel to the code and gives contributors guidelines to follow. Additionally, concrete5 (and many other major frameworks) follow the standard so it makes sense to work towards adopting the industry standard I think.

http://www.php-fig.org/psr/psr-2/
