Update core.less
Update core.less

Add all prefixed versions for appearance, per feedback.
kate2753/hopscotch,slietz/hopscotch,adcade/hopscotch,slietz/hopscotch,adcade/hopscotch,Axosoft/runningjumpscotch,renatolotfi/hopscotch,sganz/hopscotch,zimmi88/hopscotch,kate2753/hopscotch,thbar/hopscotch,zimmi88/hopscotch,Axosoft/runningjumpscotch,thbar/hopscotch,renatolotfi/hopscotch,sganz/hopscotch,Xephi/hopscotch,Xephi/hopscotch,ryanone/hopscotch,linkedin/hopscotch