fix MarkersService jshint compliant
fix MarkersService jshint compliant

davidpich/hackhappiness-app,lnolazco/hackhappiness-app,lnolazco/hackhappiness-app,Dracks/hackhappiness-app,BushidoDevs/hackhappiness-app,Geeks2Team/hackhappiness-app,angularbeers/hackhappiness-app,angularbeers/hackhappiness-app,Geeks2Team/hackhappiness-app,davidpich/hackhappiness-app,BushidoDevs/hackhappiness-app,Dracks/hackhappiness-app