matplotlib Code

Remove unused import.

Make the TimerBase start/stop implementations just simple pass instead of raising NotImplementedError. This allows creating the timers for BackendAgg, which can simplify some cases.

hexbin tests: change to a sane baseline

coding_guide: add instructions for running a single test (from Mike D.)

Pass strings to FT2Font -- never Unicode strings.

Fix docstring formatting in imshow.

Axes.hist: remove unnecessary copying of input array.

Axes.autoscale_view: ensure finite ranges; rearrange code for readability

examples/cursor_demo: update to use axhline, axvline

Axes: save "tight" state; margin() default is now tight=True