Add master to travis builds
Add master to travis builds

vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt,pradels/vagrant-libvirt,infernix/vagrant-libvirt,sendgrid-ops/vagrant-libvirt,infernix/vagrant-libvirt,electrofelix/vagrant-libvirt,sendgrid-ops/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,infernix/vagrant-libvirt,pradels/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt