finished numpification of extension code and axes.py
Removed our own MPL_isnan.h in favor of numpy's implementation
Creating branch of trunk to do some mathtext improvements
reverted some broken test code
fixed a distance bug in arrow
Fix segfault in Tk backend.
issue informative warning when calling legend() without labelled objects.
added configurable option legend.loc
Bugfixes in mlab.py to coerce inputs into numpy arrays.
In text, linespace-related changes
