Fix exception with Pillow 3

DOC: Cleaned up text in pyplot_tutorial.rst

Patch from
https://sources.debian.net/src/matplotlib/1.4.2-3.1/debian/patches/40_bts608939_draw_markers_description.patch/

Backport DOC: Fix description of draw_markers in api_changes.rst

Currently fails with qt5

Instead of a combining acute accent, use a single-codepoint encoding

DOC: Fix encoding for LaTeX

On Windows the `urlparse(...).scheme != ''` test for URLs does not work.
For file names the drive letter is returned as scheme.

Removes a Mac metafile. Closes #5176

FIX: remove incorrect error checking

This issue is that the new 'default' qt version is 5 if it is
available.  In the tests the backend is Agg so we are hitting the
fall through behavior.  If both pyqt4 and pyqt5 are installed, then
`QtCore` will be from PyQt5, but the backend_qt4Agg code assumes that it
is seeing the PyQt4 version of the classes.  This results in error on
`__init__` due to the change between PyQt4 and PyQt5.

Added test_backend_qt5.py to white listed tests.

closes #5194

Do not let a `super` be called or the the c++ base-classes will be
initialized twice which causes havoc.

 - pyside failed on figure creation
 - pyqt4 may segfault on exit

closes #5196

If:

 1. backend is not Qt{4,5}Agg
 2. PyQt4 and PySide are installed, PyQt5 is not
 3. backend.qt4 == 'PySide'

The fall through will start trying to import PyQt5 (so sip will be
imported as it is installed for PyQt4).  It will then fall back to Qt4
using the binding specified in the rcparam ('PySide') which will then
miss the qt4 import conditionals which means QtCore is never imported
which means we get name errors from the pyqt / pyside patch up code.

This catches those exceptions and gives pyside a chance to be imported.

TST: fix test_mlab.test_griddata_nn failures on Windows

TST: properly fence-post qt{4,5} backend tests