Make Travis test also with ruby-head
Make Travis test also with ruby-head

davidcelis/rack,imtayadeway/rack,liamseanbrady/rack,arronmabrey/rack,trexnix/rack,rwz/rack,Codeman655/rack,supzann3/rack,tylergannon/rack,jeremyf/rack,gfvcastro/rack,laplaceliu/rack,eavgerinos/rack,keithduncan/rack,chneukirchen/rack,deepj/rack,laplaceliu/rack,wildjcrt/rack,sigmavirus24/rack,akihiro17/rack,keepcosmos/rack,gfvcastro/rack,Codeman655/rack,keepcosmos/rack,wjordan/rack,shaneog/rack,gfvcastro/rack,sigmavirus24/rack,ganmacs/rack,AMekss/rack,gioele/rack,krainboltgreene/lack,jeremyf/rack,trexnix/rack,akihiro17/rack,akihiro17/rack,gioele/rack,keithduncan/rack,sigmavirus24/rack,zjsxwc/rack,arronmabrey/rack,Eric-Guo/rack,wjordan/rack,zjsxwc/rack,supzann3/rack,rwz/rack,liamseanbrady/rack,stepri/rack,davydovanton/rack,trexnix/rack,Codeman655/rack,deepj/rack,Comcast/rack,ngpestelos/rack,shaneog/rack,wildjcrt/rack,nmk/rack,imtayadeway/rack,chneukirchen/rack,arronmabrey/rack,ganmacs/rack,maclover7/rack,keepcosmos/rack,stepri/rack,maclover7/rack,nmk/rack,jackxxu/rack,wildjcrt/rack,keithduncan/rack,supzann3/rack,chneukirchen/rack,tylergannon/rack,nmk/rack,fabianrbz/rack,fabianrbz/rack,eins78/rack,Comcast/rack,laplaceliu/rack,davidcelis/rack,rwz/rack,Eric-Guo/rack,ngpestelos/rack,eavgerinos/rack,zjsxwc/rack,ngpestelos/rack,davydovanton/rack,davydovanton/rack,deepj/rack,tylergannon/rack,jeremyf/rack,gioele/rack,davidcelis/rack,AMekss/rack,ganmacs/rack,AMekss/rack,Eric-Guo/rack,maclover7/rack,eavgerinos/rack,eins78/rack,eins78/rack,shaneog/rack,stepri/rack,liamseanbrady/rack,Comcast/rack,jackxxu/rack,wjordan/rack,jackxxu/rack,fabianrbz/rack,imtayadeway/rack