Run tests on 1.x and 2.x versions of PHPCS

- run coding standard tests against 1.x and 2.x version of PHP, but allow 2.x version to have failures
- don't run PHPCS 2.x tests on HHVM since to result in faster build
Merge pull request #30 from aik099/27-include-phpcs-2-x-in-tests

Run tests on 1.x and 2.x versions of PHPCS, but allow 2.x version to have failures