Enabling HHVM-nightly and PHP 5.6 in builds, disallowing hhvm failures
Enabling HHVM-nightly and PHP 5.6 in builds, disallowing hhvm failures

wuxu92/common,ptlis/common,racheldomingo/common,sachintaware/common,dunglas/common,gencer/common,guiwoda/common,TomasVotruba/common,doctrine/common