Updates for 0.8.3
fixed bug related to setting gc state and clipbox, unmasked draw_markers
masked draw_markers
Fixed two bugs in ticker.py; now bar([0,1], [0,0]) works again.
fixed bug related to draw_*_collections and gc state, unmask draw_markers
Aspect ratio handling in pylab interface made consistent with axes.py.
masked _draw_markers, new API not ready for general use
Update to version 1.7.2 of pyproj
Revampled polar plot example.
mask new TextWithDash, bugs found