Enabling js lint for app.js

Signed-off-by: Kamaal Aboothalib <kamaal@kamaal.me>
installing jshint-stylish

Signed-off-by: Kamaal Aboothalib <kamaal@kamaal.me>
js linting task

Signed-off-by: Kamaal Aboothalib <kamaal@kamaal.me>
js hint pasing

Signed-off-by: Kamaal Aboothalib <kamaal@kamaal.me>