add gulp.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
convert to 4 spaces indentation.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
update readme.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add MIT License

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add travis

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>