Adding voronoi overlay of results. Copied from here: http://bl.ocks.org/shimizu/5610671
Merge pull request #1 from oholworthy/voronoi-overlay

Adding voronoi overlay of results. Copied from here: http://bl.ocks.org/...
Beer icon
5km radius, also anchor the beer icon to it's center (more or less)
A bit of a tidy up

Move the overlay variable out of the overlayVoronoi function, so it can
be referenced later when redrawing.

Same for the chiswick variable.
Attribution
More attribution
Beer icon attribution
cleanup again
overlay colours
Merge pull request #2 from oholworthy/voronoi-overlay

overlay colours
Dummy commit so that it shows up on github.io
Link to github.io
Correcting github.io url
Merge pull request #1 from lucymhdavies/master

Here's the absolute latest version