Colors and front-end refactoring

@kilianc there you go,
sorry, I was making changes in main repo., I know that feature branches are not our thing here :)

New javascript files (in `webapp/public/js`) for front-end should go to S3.
I was thinking about having a gulp structure for the frontend and a `--webapp local | latest | tag` to switch between local, latest on s3 and tagged on s3.