Leaflet.draw now comes with django-leaflet forms
Switch Git submodules for JS libraries
Fix declaration order safety checks
Make sure django-leaflet forms are loaded in the right order
Upgrade Leaflet.OverIntent
Clean-up and rename Leaflet information control file
Get rid of Geotrek stuff
Get rid of measurecontrol images here
Merge branch 'switch_to_submodules' into develop

Conflicts:
	mapentity/static/mapentity/Leaflet.label
	mapentity/static/mapentity/mapentity.js
Track compiled translations, as it is conventional in django
Pep8ify
Upgrade Leaflet.Snap