Display treemap to the nodes
fix stroke-width

sites: stroke-width = 10
clusters : stroke-width = 1
nodes: stroke-width = 0
Better padding

differenciating nodes from clusters
fix #18

fix highlight bug and remove usless element(<g> tag)
merge dev in ressources-exploitation
merge ressources-Exploitation -> search
Merge branch 'Search' of github.com:fhermeni/hotplaces into Search

Conflicts:
	src/main/webapp/js/treemap.js