Clean up and document travis.yml more.
Clean up and document travis.yml more.

WinnySilva/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,alpha721/WikiEduDashboard,majakomel/WikiEduDashboard,feelfreelinux/WikiEduDashboard,adamwight/WikiEduDashboard,WinnySilva/WikiEduDashboard,thenickcox/WikiEduDashboard,ragesoss/WikiEduDashboard,MusikAnimal/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,KarmaHater/WikiEduDashboard,alpha721/WikiEduDashboard,ragesoss/WikiEduDashboard,MusikAnimal/WikiEduDashboard,KarmaHater/WikiEduDashboard,alpha721/WikiEduDashboard,alpha721/WikiEduDashboard,sejalkhatri/WikiEduDashboard,Wowu/WikiEduDashboard,Wowu/WikiEduDashboard,ragesoss/WikiEduDashboard,sejalkhatri/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,feelfreelinux/WikiEduDashboard,majakomel/WikiEduDashboard,MusikAnimal/WikiEduDashboard,majakomel/WikiEduDashboard,adamwight/WikiEduDashboard,feelfreelinux/WikiEduDashboard,feelfreelinux/WikiEduDashboard,sejalkhatri/WikiEduDashboard,sejalkhatri/WikiEduDashboard,Wowu/WikiEduDashboard,MusikAnimal/WikiEduDashboard,thenickcox/WikiEduDashboard,Wowu/WikiEduDashboard,KarmaHater/WikiEduDashboard,WinnySilva/WikiEduDashboard,KarmaHater/WikiEduDashboard,majakomel/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,thenickcox/WikiEduDashboard,sejalkhatri/WikiEduDashboard,adamwight/WikiEduDashboard