cut top margin of dashboard to 15px
cut top margin of dashboard to 15px

junjiem/CBoard,hjtoday/CBoard,bigdata-eqxiu/CBoard,junjiem/CBoard,xiaochen2012/CBoard,yzhang921/CBoard,xiaochen2012/CBoard,hjtoday/CBoard,junjiem/CBoard,hjtoday/CBoard,bigdata-eqxiu/CBoard,yzhang921/CBoard,bigdata-eqxiu/CBoard,hjtoday/CBoard,xiaochen2012/CBoard,yzhang921/CBoard,junjiem/CBoard,yzhang921/CBoard,bigdata-eqxiu/CBoard,xiaochen2012/CBoard