We decided to use Gulp and a bunch of real frontend tools like Browserify and Sass. We moved all the assets to a `frontend` directory, uninstalled the gem wrapp

We decided to use Gulp and a bunch of real frontend tools like Browserify and Sass. We moved all the assets to a `frontend` directory, uninstalled the gem wrappers for js libraries and switched to npm to manage them. The assets pipeline is good for small apps, but when you grow, you need the right tools. Frontend tools are good for frontend, no matter how you like or dislike the Javascript ecosystem.