fix bug preventing drawing of parallels in some projections.
apply sf patch 2831704, regnerate c source files with cython 0.11.2
prepare for new release
use np.loadtxt instead of mlab.load
fix url
add code to import pyplot as necessary
simplify _check_ax method
put ax checking code in a separate private method
fix bug in spines
change mlab.load to np.loadtxt
