update jshint config.

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

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

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
add jshint task on build process.

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