MAINT: Replace plt.<cmd> pattern with explicit fig/ax calls
#295
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My understanding is that explicit figure/axis creation is the recommended pattern for
pyploton the basis of "explicit-over-implicit". Since one of the goals of numpy-tutorials is to highlight best-practices for scientific programming, I figured it'd be worthwhile to attempt to emphasize the OO pattern as opposed to the implicit fig/ax creation fromplt.imshow,plt.plot, etc.I don't have strong feelings though - I'm curious to what degree (if any) mpl folks would view this as an improvement @ksunden.