Code snippet: weigh by relative importance

It was originally a snippet to do a tag cloud, but I needed to show places on a map. weigh_by_relative_importance now lives as a gist.

Like Semantic Menu, it was developed while working for Bloom Digital, which continues to encourage me to release as open source whatever generic work I do for them.

They are still looking for a junior to intermediate developer; a good opportunity for someone wanting to tackle hard problems with cutting edge technologies.