PSR1: camelcaps method name check ignores magic methods

my build was broken with the warning below:

`/home/travis/build/scabbiafw/scabbia2/src/Events/Delegate.php:59:19: error - Method name "Delegate::__set_state" is not in camel caps format`

and I noticed that PSR-1 sniffers includes magic methods during the method name checking as well. this PR makes PSR-1 standard to exclude names of magic methods.