Updated CHANGELOG for recent aspect ratio handling changes.
Another increment of aspect ratio handling; make polar plots stay circular.
minor tweak in kwargs for fill example
Changed isinstance(x,str) to is_string_like(x)
Bugfix: prevent x=='None' comparison if x might be numarray array
Changed 0.8.3 to 0.9.
Updates for 0.8.3
Added polarmaps example.
Remove deprecated createfigure call
fixed a bug related to green markers