Filter populates a multi-select for narrower filtering
Histogram can now change according to filtered (+narrowed too!) data. Added y axis to Histogram
Histogram can now filter according to Time scale (in addition to categories).
Though... Still not sure if the graphs are using the right data.
Use 1000 points instead of 100 for the map. Active regions are highlighted.
Brushing over the bars highlights paths on the map.
Issue #2: "Major" severity paths are red on the map, others are green
Issue #3: Add a grand total for all histogram bars
Select filtering works correctly, except for multiple select.
Now able to select multiple values in narrow filter
Add 4000 random data samples
Make the map and histogram smaller  (fits side by side on a 15" screen)
user 4000 paths on map instead of 1000, tiny css changes
paths highlighted by hovering over bar graphs are transparent so you can see overlap a bit easier
centre map better
add more stats to epic tooltip
Gilbert: user can filter by cause on the histogram
user can show only severe paths with a checkbox
comment out console.log()