#143: Spliting navigator.js in multiple files
#143: Not allowing default handling of Tab and Shift-Tab events for keyboard navigation
#143: Refactoring FieldsHandler
#143: Allowing selection of first field of first question of current section if no question active on tab event; Initializing form with first field active
#143: Representing questions on form with fieldsets. Improvements on style
#143: Showing value of unselected question / Making UI more compatible to styleguide / Improvements on UI