add/remove wrapper's class before the sticky event is triggered
add/remove wrapper's class before the sticky event is triggered

ConeDeathAPS/sticky,nickhudkins/sticky,murilofsouza/sticky,EricHodgins/sticky,zonayedpca/sticky,iCasa/sticky,rcleozier/sticky,EllieAdam/sticky,prashen/sticky,srinivashappy/sticky,codedogfish/jquery-sticky,garand/sticky,alesitalugo/sticky,HashtagPurvi/sticky,garand/Sticky,alesitalugo/sticky,Vazgen7788/sticky,garand/Sticky,codedogfish/jquery-sticky,EricHodgins/sticky,garand/sticky,EllieAdam/sticky,rabbyalone/sticky,nickhudkins/sticky,ConeDeathAPS/sticky,phanvanthanh/sticky,rcleozier/sticky,murilofsouza/sticky,Vazgen7788/sticky,srinivashappy/sticky,zonayedpca/sticky,HashtagPurvi/sticky,tofanelli/sticky,prashen/sticky,phanvanthanh/sticky,tofanelli/sticky,iCasa/sticky,rabbyalone/sticky