leaderboard map doesn't show all edit

[dalekunce]

http://www.missingmaps.org/leaderboards/#/hurricaneirma,irma/map

[kamicut]

@dalekunce the redis cache only holds a certain amount of features for space considerations (we don't want to replicate all of OSM), so we limited it to the most recent 100 features per mapathon. That limit could be increased, but storing all the geometries could be prohibitively expensive.