Use day calendar to navigate line chart
Allow loading of all data in stacked area chart
sort stacked area legend
Make min_focus and max_focus dynamic
Merge branch 'navigate'

Conflicts:
	charts/js/charts.js
Add javascript code to fetch data from cartodb
use cal-heatmap that can color empty values
Draw charts dynamically
Restructure SQL statements
Add functions to fetch total distance
Add function to convert to total hours chart
Fix bug in sql query
Remove logging for debugging
Convert hour to int
Add total distance per hour chart