LaTeX reader: Handle comments at the end of tables.

This resolves the issue illustrated in
http://stackoverflow.com/questions/24009489/comments-in-latex-break-pandoc-table.

src/Text/Pandoc/Readers/LaTeX.hs

@@ -1269,6 +1269,7 @@ simpTable = try $ do
   header' <- option [] $ try (parseTableRow cols <* lbreak <* hline)
   rows <- sepEndBy (parseTableRow cols) (lbreak <* optional hline)
   spaces
+  skipMany (comment *> spaces)
   let header'' = if null header'
                     then replicate cols mempty
                     else header'