axes_grid: doc update
legend supports CircleCollection.
some tweaks to csv2rec and rec2csv
add code to import pyplot as necessary
simplify _check_ax method
put ax checking code in a separate private method
backend_agg.draw_marker quantizes the main path (checking in a missed file)
backend_agg.draw_marker quantizes the main path
axes_grid: floating_axis support added
fix bug in spines