Rewrite web app views to use API calls

[rhsimplex]

Following the merge of #18, we can now vastly simplify the web application (and testing) by making sure we use the proper API routes. Also should follow #23

[jan-xyz]

I would suggest to use a library like requests to consume the API and afterwards validate the data and feed it into the template. How does that sound?

EDIT: I actually want to withdraw my previous proposal. By working on dividing web front and and api into separate modules I was thinking about a better approach. The front-end needs JavaScript anyways to handle the different types of visualisers dynamically. With that I would suggest using JQuery. I don't have any experience with it yet but I think I can get this fairly simple project going with it. For a bit of insight see: http://flask.pocoo.org/docs/0.12/patterns/jquery/