Fixed bad quiver transforms.
Fixed failing test on travis.
Attempt at updating the pickle image test.
BUG : instantiate fall-back writer

fixes #2651

If the a string is passed into save as `writer` the code tries to
look up a writer with that name and create it.  If a writer with that
name is not in the registry, it is replaced with the name of the first
writer that _is_ in the registry, but not an instance of that type.
DOC: specified the keys of the dictionaries returned by cbook.boxplot_stats
DOC: formatted key-value list as a table and added some latex math
WebAgg: extracted figure_div style into css and changed layout

Set #figure-div display style to inline-block to use free space on the page
more effectively. See http://www.vanseodesign.com/blog/demo/inline-block/.
Additionally, set margin to 10px around every figure, so padding-bottom
becomes unnecessary.
DOC: fixed newlines around table and end of docstring
WebAgg: reuse already running Tornado ioloop

    If a Tornado ioloop is already running before WebAggApplication.start() is called,
    it should be re-used instead of trying to start it again. This allows one to
    use WebAgg in his/her external Tornado application.
DOC/ENH : get/set_size_inches

Added links between `get_size_inches` and `set_size_inches`

Added an `np.array` call to `get_size_inches` to return a copy of
the size, instead of a reference to the internal np.array.

Closes #2303
EXP : turn of clipping in spine example

Turn off clipping in the spine placement demos.

Closes #2795
(fix #2097) PGF: get fonts from fc-list, use builtin fonts for tests
quiver: handle autoscaling with quiverkey when animated

Added a test. Closes #2616.
Merge pull request #2835 from efiring/quiver_animate

quiver: handle autoscaling with quiverkey when animated
Merge pull request #2819 from phobson/boxplot-doc

DOC: clarified docstring for cbook.boxplot_stats
BUG : Qt repaint workaround on windows

Added platform specific replacement of `update` with `repaint` in
`FigureCanvasQtAgg.draw` for windows.
DOC : minor tweaks to set/get_size_inches

 - better numpydoc style
 - added inch <-> cm conversion factor
Fix IPython detection.  Fix encoding error on Python 3
Remove _in_ipython
Fix bug in horizontal step histograms