Auto-center the map and render media. (0.5.0a)

The GeoJSON validator has been moved to a new file. The map now
auto-centers based on the data it is displaying. Images, text, sources,
and timestamps now render in the popup boxes (if present). Epicenters
now specify their own radii, and example.geojson has been updated to
demonstrate these new features (the data does not necessarily make
sense as it is taken from multiple places).