Due to scoping fixes in py3k, list comprehensions over class level
attributes during class definition does not work (see
http://stackoverflow.com/questions/13905741/accessing-class-variables-from-a-list-comprehension-in-the-class-definition).

Superficially Fixes matplotlib#3436. There seem to be other issues

closes matplotlib#3423

minimum version for freetype is 2.3

closes matplotlib#3412

When formatting the png data to send over the wire need to decode the
byte string to ascii.  If this is not done the literal string sent
to the browser is:
   "data:image/png;base64,b'iVBOR...'"
instead of
   "data:image/png;base64,iVBOR..."

The extra b' makes the string no longer a valid png which is why
we were getting white boxes

DOC : More doc fixes

Allow python 3 version of PyCXX

…correct tick interval

_get_clip_path was returning '<built-in function id>' instead
of the ps-function name like it should have been.  This was introduced
in 9b9c0c6 in PR matplotlib#2927.

Closes matplotlib#3523

BUG : fix eps corruption when using clipping

…hould

silence most warnings in the html only small build on travis

BUG : use getcwdu to deal with unicode in user home-path in python 2

BUG : Only insert links to pdfs if we are actually generating these.

BLD : improve setupext.py on windows

 - moved logic to parse sym from bxp -> boxplot
 - restored documented behavior with `sym=''`
 - change default value of sym from 'b+' -> None
   - should not be visible from outside as default behavior remains
     the same

closes matplotlib#3459

Changed to be True to match the code

closes matplotlib#3455

BUG : Added legend.framealpha to rcParams, as mentioned in axes.legend docstring

BUG/DOC : Correct default value listed in docstring

Restore the value of `whis` to the input value at the top of each pass
through the for-loop.

@WeatherGod hit the nail on the head.

closes matplotlib#3468

BUG : fixes whis over-writing in boxplot_stats

BUG : nbagg py3k compatibility

 turns out we really need version 1.4 or better

fixes matplotlib#3538

…rror_message

MNT : Provide an informative error message if something goes wrong in setfont

… set to 100 ms

MNT : Typo in comment documentation for example timers.py

TST : Install texlive and other dependencies when building docs.

ENH : improve nbagg backend

If the user does not pass in a label, do not assign one.

Fixes matplotlib#3563

if the new style introspection GObject python bindings are in use.  With
pygobject >= 3.13.4 the following:

    from gi.repository import GObject
    from matplotlib import pyplot

causes an exception to be raised:

> AttributeError: When using gi.repository you must not import static modules
> like "gobject". Please change all occurrences of "import gobject" to "from
> gi.repository import GObject". See:
> https://bugzilla.gnome.org/show_bug.cgi?id=709183

It is not valid to use both non-introspection based and introspection based
PyGObject in the same process.  Backend probing will `import gobject` (i.e. the
non-introspection bindings) if it sees that the 'gtk' module is loaded.
Unfortunately it wouldn't check if this was the pygi or old-style gtk module.
This commit adds this check avoiding the exception.

This check was added to PyGObject in [d704033][1]

[1]: https://git.gnome.org/browse/pygobject/commit/?id=d704033

 - added check that labels don't get adding by default

If a data list is empty, return a dict full of np.nan.

Closes matplotlib#3569 and addresses part of
pandas-dev/pandas#8382

Build dep updates

BUG : Ticks on top axis disappear if tick size is too large (when using bbox_inches='tight')

BUG : fix handling of flierprop by boxplot

BUG : deal with empty list passed to boxplot

Fixed the differencing of images for the webagg/nbagg backends.

BUG : don't assume label in boxpplot_stat

merge V1.4.0-doc into v1.4.x