Build all branches (including gh-pages) on Travis CI. Closes #1341
Build all branches (including gh-pages) on Travis CI. Closes #1341

CupOfTea696/prism,byverdu/prism,mAAdhaTTah/prism,PrismJS/prism,PrismJS/prism,PrismJS/prism,CupOfTea696/prism,CupOfTea696/prism,mAAdhaTTah/prism,CupOfTea696/prism,mAAdhaTTah/prism,CupOfTea696/prism,byverdu/prism,byverdu/prism,byverdu/prism,PrismJS/prism,mAAdhaTTah/prism,byverdu/prism,PrismJS/prism,mAAdhaTTah/prism