added appearance proxy capability for styling properties when running on ios 5 and later
added appearance proxy capability for styling properties when running on ios 5 and later

sekouperry/ODRefreshControl,lijie121210/ODRefreshControl,Sephiroth87/ODRefreshControl,liuzechen/ODRefreshControl,lujianwenance/ODRefreshControl,zhouwude/ODRefreshControl,cnbin/ODRefreshControl,onetot/ODRefreshControl,alterant-kr/ODRefreshControl,hugo-/ODRefreshControl,ywzw2013/ODRefreshControl,lyndonChen/ODRefreshControl,bboyesc/ODRefreshControl,gank0326/waterRefresh,HelloZhu/ODRefreshControl