Allow HHVM failures until they upgrade to v3
Allow HHVM failures until they upgrade to v3

sudiptpa/libphonenumber-for-php,Xephi/libphonenumber-for-php,giggsey/libphonenumber-for-php,gencer/libphonenumber-for-php,BenMorel/libphonenumber-for-php,lukebeer/libphonenumber-for-php,digideskio/libphonenumber-for-php