Bar should scroll horizontally for excess columns

[timwis]

When you have a dataset that has 100 categories, it's a bit much to fit that all into a bar chart. Vizwit v1 lets you scroll horizontally. We'll need to investigate whether ~~Chart.js plottable.js lets you do that. In theory, it's possible to write that functionality ourselves (we're just changing the underlying dataset being shown on the chart) but it'd be nice if it came out of the box.~~

EDIT: This is particularly important for mobile-friendly

[timwis]

Someone's done it in this fiddle. Related SO question. And this fiddle is another example.

[timwis]

There's also http://plottablejs.org/docs/classes/plottable.interactions.panzoom.html

[timwis]

In the d3 world, here's an example.