Remove parameter

It's not used in any of the validation checks, and I don't see a reason it will be in the near future.
Fix test
Return should be boolean.

preg_match returns 0,1 or false.
Update in-line documentation
Update code to PSR-2
Merge branch 'feature/clean_up_code' into develop
Run ErrorMessages test as well.
Travis update

- Use PHP 5.5
- Run code coverage for integration with scrutinizer-ci