Fixes problem raised in #1431
Fix Python 3 bug in PS backend.
Another Python3 bytes/unicode fix
Flush file handles at the end, since Python 3 won't do it for us.
Re-write stacked step histogram
Fix bug in stacked bar histogram. Also, calling hist with `log=True` now
behaves correctly in all cases.
Update a few test baseline images
PEP8 fixes
Remove duplicate test_hist_offset
Merge pull request #1779 from mdboom/ps/python3

Bug in postscript backend in Python 3
Merge pull request #1790 from pelson/set_transform_on_artist

Fixes problem raised in #1431 (```get_transform``` should not affect ```is_transform_set```)
Merge pull request #1724 from neggert/hist_stack_round2

Re-write stacked step histogram
improve snapping in agg backend
Fix a number of snapping issues.  Incorporates ideas from #800 (see there for further discussion) and #1591.  This, unlike #800, doesn't change the snapping in a fundamental way, but it does help with text/image/marker alignment of snapped and non-snapped objects.
Add a test based on @pelson's example in #1591.
Merge pull request #1800 from mdboom/agg_snapping2

Agg snapping fixes (for the last time...?) :)
Merge remote-tracking branch 'upstream/v1.2.x'

Conflicts:
	lib/matplotlib/axes.py
	lib/matplotlib/tests/baseline_images/test_axes/axhspan_epoch.png
	lib/matplotlib/tests/baseline_images/test_axes/axvspan_epoch.png
	lib/matplotlib/tests/baseline_images/test_axes/boxplot.png
	lib/matplotlib/tests/baseline_images/test_axes/canonical.png
	lib/matplotlib/tests/baseline_images/test_axes/const_xy.png
	lib/matplotlib/tests/baseline_images/test_axes/contour_colorbar.png
	lib/matplotlib/tests/baseline_images/test_axes/contour_hatching.png
	lib/matplotlib/tests/baseline_images/test_axes/errorbar_basic.png
	lib/matplotlib/tests/baseline_images/test_axes/errorbar_mixed.png
	lib/matplotlib/tests/baseline_images/test_axes/errorbar_zorder.png
	lib/matplotlib/tests/baseline_images/test_axes/fill_units.png
	lib/matplotlib/tests/baseline_images/test_axes/formatter_large_small.png
	lib/matplotlib/tests/baseline_images/test_axes/formatter_ticker_001.png
	lib/matplotlib/tests/baseline_images/test_axes/formatter_ticker_002.png
	lib/matplotlib/tests/baseline_images/test_axes/formatter_ticker_003.png
	lib/matplotlib/tests/baseline_images/test_axes/formatter_ticker_004.png
	lib/matplotlib/tests/baseline_images/test_axes/formatter_ticker_005.png
	lib/matplotlib/tests/baseline_images/test_axes/hist2d.png
	lib/matplotlib/tests/baseline_images/test_axes/hist2d_transpose.png
	lib/matplotlib/tests/baseline_images/test_axes/hist_log.png
	lib/matplotlib/tests/baseline_images/test_axes/hist_stacked.png
	lib/matplotlib/tests/baseline_images/test_axes/hist_stacked_stepfilled.pdf
	lib/matplotlib/tests/baseline_images/test_axes/hist_stacked_weights.pdf
	lib/matplotlib/tests/baseline_images/test_axes/hist_stacked_weights.png
	lib/matplotlib/tests/baseline_images/test_axes/imshow_clip.png
	lib/matplotlib/tests/baseline_images/test_axes/log_scales.png
	lib/matplotlib/tests/baseline_images/test_axes/markevery.png
	lib/matplotlib/tests/baseline_images/test_axes/markevery_line.png
	lib/matplotlib/tests/baseline_images/test_axes/nonfinite_limits.png
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	lib/matplotlib/tests/baseline_images/test_axes/polar_units_2.png
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