Add hhvm to versions that travis tests against
Add hhvm to versions that travis tests against

dnacreative/SimpleLance,dnacreative/SimpleLance,SimpleLance/SimpleLance,SimpleLance/SimpleLance,rogerapras/SimpleLance,SimpleLance/SimpleLance,dnacreative/SimpleLance,SimpleLance/SimpleLance,rogerapras/SimpleLance,rogerapras/SimpleLance,dnacreative/SimpleLance,rogerapras/SimpleLance