Update docs for releasing 2.1
Update docs for releasing 2.1

LzhElite/seajs,baiduoduo/seajs,jishichang/seajs,tonny-zhang/seajs,ysxlinux/seajs,moccen/seajs,Lyfme/seajs,AlvinWei1024/seajs,angelLYK/seajs,miusuncle/seajs,eleanors/SeaJS,MrZhengliang/seajs,evilemon/seajs,Gatsbyy/seajs,kaijiemo/seajs,AlvinWei1024/seajs,eleanors/SeaJS,sheldonzf/seajs,longze/seajs,treejames/seajs,sheldonzf/seajs,longze/seajs,twoubt/seajs,JeffLi1993/seajs,evilemon/seajs,chinakids/seajs,sheldonzf/seajs,judastree/seajs,FrankElean/SeaJS,treejames/seajs,mosoft521/seajs,zaoli/seajs,kuier/seajs,yern/seajs,zaoli/seajs,zwh6611/seajs,yuhualingfeng/seajs,kaijiemo/seajs,wenber/seajs,imcys/seajs,ysxlinux/seajs,hbdrawn/seajs,twoubt/seajs,Lyfme/seajs,angelLYK/seajs,baiduoduo/seajs,wenber/seajs,seajs/seajs,angelLYK/seajs,lianggaolin/seajs,judastree/seajs,zwh6611/seajs,LzhElite/seajs,liupeng110112/seajs,kuier/seajs,MrZhengliang/seajs,zaoli/seajs,eleanors/SeaJS,121595113/seajs,moccen/seajs,lee-my/seajs,uestcNaldo/seajs,coolyhx/seajs,baiduoduo/seajs,coolyhx/seajs,yuhualingfeng/seajs,treejames/seajs,imcys/seajs,mosoft521/seajs,hbdrawn/seajs,tonny-zhang/seajs,Lyfme/seajs,FrankElean/SeaJS,MrZhengliang/seajs,FrankElean/SeaJS,zwh6611/seajs,chinakids/seajs,ysxlinux/seajs,kaijiemo/seajs,miusuncle/seajs,miusuncle/seajs,judastree/seajs,PUSEN/seajs,lee-my/seajs,wenber/seajs,lianggaolin/seajs,liupeng110112/seajs,yern/seajs,lianggaolin/seajs,coolyhx/seajs,evilemon/seajs,yuhualingfeng/seajs,mosoft521/seajs,lovelykobe/seajs,LzhElite/seajs,13693100472/seajs,seajs/seajs,kuier/seajs,imcys/seajs,liupeng110112/seajs,lovelykobe/seajs,yern/seajs,longze/seajs,moccen/seajs,lee-my/seajs,121595113/seajs,PUSEN/seajs,JeffLi1993/seajs,lovelykobe/seajs,uestcNaldo/seajs,uestcNaldo/seajs,Gatsbyy/seajs,twoubt/seajs,Gatsbyy/seajs,JeffLi1993/seajs,jishichang/seajs,seajs/seajs,AlvinWei1024/seajs,PUSEN/seajs,13693100472/seajs,tonny-zhang/seajs,jishichang/seajs