fixed example axes_grid demo_axes_rgb.py figure 1#6759

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naheld wants to merge 5 commits intomatplotlib:masterfrom

naheld:fix-ex-demo_axes_rgb

Commits on Jul 16, 2016

fixed example axes_grid demo_axes_rgb.py figure 1
naheld
committed

Commits on Jul 19, 2016

Merge https://github.com/matplotlib/matplotlib into fix-ex-demo_axes_rgb
naheld
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Make tickmarks invisible in figure 1 for axes_grid ex demo_axes_rgb.
naheld
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Commits on Jul 20, 2016

Resolving pep8 error (white space on line 58 and adding spaces after hash in comment lines)
naheld
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Commits on Jul 21, 2016

Resolving tickmark problem in figure 2 ax_b for example demo_axes_rgb
naheld
committed