HHVM support #157
Description
Tests are now passing for the latest HHVM version except one. The failing test is because of an expected bug in PHP which HHVM doesn't seem to reproduce:
https://travis-ci.org/mnapoli/PHP-DI/jobs/20882256
Once this is solved, HHVM should be moved out of the "allowed failure" in Travis config and support should be maintained in the future.