Upgrade leaflet.
Get rid of the "d" argument.
Go from MongoDB 2.2/2d to Mongo 2.4/2dsphere indexes.
Application display changes.

We now show the distance (if available too).
Add support for storing suggestions to new values.
Only store tags when the array is not empty.

This saves a lot of space in the index and also makes it easier to find only
objects that have tags in the first place.