Limit number of addresses shown in map

[joshsmith]

The UX for this hasn't been thought through very well, but we should try to limit the max number of addresses returned by the API. I don't believe there's a limit right now. It should probably try to show the nearest to an address first, or try spreading them out in a region.

[joshsmith]

This is a really huge issue, actually. Even though I appear to have resolved the 503 errors in most cases, the requests are still extraordinarily slow.

According to geokit-rails we can do:

def closest(options = {})
  geo_scope(options).order("#{distance_column_name} asc").limit(1)
end

In addresses controller we'll need to change .within to use .closest that simply calls within instead of geoscope with an order and limit.

[joshsmith]

Given that it's bugging out on just 400 of these records, we might want to limit to just 100.