Add 'situateur' chart

Conflicts:
	openfisca_web_ui/static/js/modules/helpers.js
	openfisca_web_ui/static/js/views/DistributionChartV.js
	openfisca_web_ui/static/js/views/LocatingChartV.js
	openfisca_web_ui/static/js/views/WaterfallChartV.js
	openfisca_web_ui/static/js/views/appV.js
Declare nvd3 path in require config.