use enum type
fixed JS routing problem
use breadcrumb
added items for question type
fixed visibility for non-JS user agent
improved styles and selection of question type
use scala enum for JS
improved router
added view for each question types
changed admin view
improved design
use enum values if possible
fix app variable scope
use existential operator if possible
refactored Question constructors
added an error message for HTTP 400
remove unnecessary properties from request JSON
WIP: creating model classes