EPIC #235: Front-end reworking

[FRosner]

Problem

The front-end is a very organic JavaScript construct. It does not use MVC, nor does it have proper abstractions over the REST API. Also it is not stateless (i.e. you cannot refresh the page without losing information).

Solution

Use a proper MVC framework for the front-end and rework the way configuration properties are stored so the page is actually refreshable. Also the MVC makes front-end code a lot more testable.

Subtasks

• SUB #235: Use AngularJS directives and templates to generate the HTML #243 use MVC framework
• SUB #235: Configuration and ID as Servable members (also in back-end) #237 configuration as part of servable object (JS)
• SUB #235: Replace JavaScript cache with back-end REST (UPDATE) #238 replace document cache by REST call
• SUB #235: Add JavaScript tests #244 add JS tests

I need to check if there are no TODOs left I created on the way (Scala and JS).