ci(travis) Include Vert.x in test matrix again and tweak build parameters.
ci(travis) Include Vert.x in test matrix again and tweak build parameters.

msavy/apiman,apiman/apiman,msavy/apiman,kahboom/apiman,kahboom/apiman,msavy/apiman,msavy/apiman,EricWittmann/apiman,jcechace/apiman,apiman/apiman,jcechace/apiman,apiman/apiman,jcechace/apiman,kahboom/apiman,jcechace/apiman,apiman/apiman,msavy/apiman,apiman/apiman,EricWittmann/apiman,EricWittmann/apiman,EricWittmann/apiman,jcechace/apiman,EricWittmann/apiman,kahboom/apiman,kahboom/apiman