Merge branch 'master' into develop
Transform rows' content to string type. let num can be the title. issue #37

Signed-off-by: Lee <jessy1092@gmail.com>
Transform rows' content to string type. use map function. issue #37

Signed-off-by: Lee <jessy1092@gmail.com>
Merge pull request #41 from hackfoldr/develop

Transform rows' content to string type. close #37