added some comments for _setupCTAButton()
added some comments for _setupCTAButton()

Xephi/hopscotch,Axosoft/runningjumpscotch,sganz/hopscotch,Xephi/hopscotch,renatolotfi/hopscotch,k10world/Hopscotch,linkedin/hopscotch,zimmi88/hopscotch,renatolotfi/hopscotch,stephenh/hopscotch,kate2753/hopscotch,slietz/hopscotch,thbar/hopscotch,ryanone/hopscotch,adcade/hopscotch,thbar/hopscotch,zimmi88/hopscotch,sganz/hopscotch,Axosoft/runningjumpscotch,slietz/hopscotch,stephenh/hopscotch,dataquestio/hopscotch,adcade/hopscotch,kate2753/hopscotch,dataquestio/hopscotch