fix bug where reduce_C_function was being misapplied in hexbin()
Add contains method to QuiverKey
Added optional C and reduce_C_function arguments to axes.hexbin().
more broken example fixes
fixed a couple of examples
fix contains() method for Lines
widgets.py: replace tabs with spaces
Fix contains() for collections, moving common code from draw() into a function
Fix str() method for Wedge artist
support unicode when printing Text artist with str(artist)
