resolves #54,support multi-author
resolves #54,support multi-author

hjue/JustWriting,xiaotianhu/JustWriting,moqiguzhu/JustWriting,jockchou/JustWriting,moqiguzhu/JustWriting,xiaotianhu/JustWriting,hjue/JustWriting,beealone/JustWriting,beealone/JustWriting,beealone/JustWriting,xiaotianhu/JustWriting,jockchou/JustWriting,moqiguzhu/JustWriting,jockchou/JustWriting,hjue/JustWriting