added unit test for rcParam['legend.scatterpoints']
added rcParam['legend.scatterpoints']
tweaked comments to no longer be a TODO
A quick hack to get the WebAgg backend working with `ipython --pylab` until proper IPython integration can be done.
added explicit 'zorder' kwarg to `Colection` and `LineCollection`.

removed class level zorder assignment.

It is not strictly necessary for LineCollection to take zorder as a
kwarg, but added to keep the default zorder the same
changed how `draw` handles alpha in `markerfacecolor` so that the set
value respected.
added guards to deal with 'none' case properly
added test for translucent markers
added change log entry for #1504 and #1505
documentation tweak
pep8 fixes
Merge pull request #1505 from tacaswell/issue1504

NF - Transparency for markers.
Merge pull request #1651 from mdboom/webagg/pylab_compatibility

WebAgg: pylab compatibility
PEP8 fix
Merge pull request #1654 from tacaswell/collection_zorder_kwarg

added explicit 'zorder' kwarg to `Colection` and `LineCollection`.
Merge pull request #1634 from tacaswell/scatterpoint_rcParam

add scatterpoints to  rcParam
Fix shifted ylabels (#1571)

Force 'anchor' rotation mode when setting the label position,
and use the appropriate alignment for the Y-label position.
Merge pull request #1589 from dopplershift/fix_ylabels

Fix shifted ylabels (Issue #1571)