floor plan images are now resources in images/ not stored in DB any more
added heavens gate

fixed bugs in controllers
prevent updating of associated objects as side effect
added floor plan andular directive

using leaflet directive
added boulder directive for displaying boulders on floor plan

changed floor plan directive to take whole floorplan, not only image of it as param
removed boulder directive again, too complicated

see issue https://github.com/angular/angular.js/issues/6127
whitespace cleanup and renaming of model in controller
using custom markers
turned floor plan directive into image map directive
added image markers to image map directive
added gymFloorPlan directive for managing boulders on a floor plan
reacting to changing floor plans in directive now
displaying ascents for selected boulder
linked gymOverview from index page
added sessions to gym overview