added quadtree, clustering is not used yet. Right now, the app creates a quadtree with every request. Still needs a lot of work
fixed the quadtree module. Added a central folder for all tests
cleaned public from quadtree until I know how to integrate it correctly
added a special case when calculating the average value of a single object
small renaming
Merge branch 'master' into static-html
Correction du design et bouton de réglage avec reveal en cours