Make more buchner-y

This does a bunch of things:
* Adds Flask-Funnel
* Adds node.json to prompt buchner-buildpack to install node, npm and
  all the required node packages
* Adds a Buildfile to complete neccessary build actions (bundling assets
  and running migrations)
* Update requirements
* Update jQuery and use Google CDN when available
* Add a command to the manager to check app.config values