Bases: django.template.Node
http://www.mellowmorning.com/2010/08/24/
custom paginator tag Inspired from http://blog.localkinegrinds.com/2007/09/06/digg-style-pagination-in-django/
Creates an <img> for a user’s Gravatar with a given size.
This tag can accept a User object, or a dict containing the appropriate values.
do a logarithmic mapping calcuation for a proper size for tagging cloud Algorithm from http://blogs.dekoh.com/dev/2007/10/29/choosing-a-good- font-size-variation-algorithm-for-your-tag-cloud/