修改生成PDF和Epub时的出错信息
Merge pull request #13 from yuanwowo/master

Update setup.md
Merge pull request #5 from MozillaChina/master

上游更新
更新进度
Merge pull request #14 from meteormatt/master

更新
MDN
Merge pull request #15 from meteormatt/master

MDN
Merge pull request #1 from MozillaChina/master

merge