Improve mathtext superscript placement.
add robinson and sinusoidal examples, fix verbage in azeqd example.
Committing CHANGELOG
Clear rcParams state between documentation plots.
Fix custom scales in pcolormesh (thanks, Matthew Turk)
bug fixes - edgecases
added mollweide example
Add agenda for 2008 SciPy tutorial, plus misc. updates to scripts.
fix numpy, ma imports in geo.py
O(n) implementation of Grouper.__iter__