Travis: Revert to using tests.py. Temp fix for #4720

[jenshnielsen]

Temporary fix for #4720

[tacaswell]

Thanks.

I can not reproduce the travis issue locally

22:43 $ python setup.py test --nocapture --processes=8 --process-timeout=300 --pep8-only
============================================================================
Edit setup.cfg to change the build options

BUILDING MATPLOTLIB
            matplotlib: yes [1.5.dev1]
                python: yes [3.4.3 |Continuum Analytics, Inc.| (default, Jun
                        4 2015, 15:29:08)  [GCC 4.4.7 20120313 (Red Hat
                        4.4.7-1)]]
              platform: yes [linux]

REQUIRED DEPENDENCIES AND EXTENSIONS
                 numpy: yes [version 1.9.2]
              dateutil: yes [using dateutil version 2.4.2]
                  pytz: yes [using pytz version 2015.4]
               tornado: yes [using tornado version 4.2]
             pyparsing: yes [using pyparsing version 2.0.3]
                libagg: yes [pkg-config information for 'libagg' could not
                        be found. Using local copy.]
              freetype: yes [version 2.5.2]
                   png: yes [version 1.6.17]
                 qhull: yes [pkg-config information for 'qhull' could not be
                        found. Using local copy.]

OPTIONAL SUBPACKAGES
           sample_data: yes [installing]
              toolkits: yes [installing]
                 tests: yes [using nose version 1.3.7 / using unittest.mock]
        toolkits_tests: yes [using nose version 1.3.7 / using unittest.mock]

OPTIONAL BACKEND EXTENSIONS
                macosx: no  [Mac OS-X only]
                qt5agg: no  [PyQt5 not found]
                qt4agg: yes [installing, Qt: 4.8.6, PyQt: 4.8.6; PySide not
                        found]
               gtk3agg: no  [Requires pygobject to be installed.]
             gtk3cairo: no  [Requires pygobject to be installed.]
                gtkagg: no  [Requires pygtk]
                 tkagg: yes [installing, version not identified]
                 wxagg: no  [requires wxPython]
                   gtk: no  [Requires pygtk]
                   agg: yes [installing]
                 cairo: yes [installing, cairocffi version 1.10.0]
             windowing: no  [Microsoft Windows only]

OPTIONAL LATEX DEPENDENCIES
                dvipng: yes [version 1.14]
           ghostscript: yes [version 9.16]
                 latex: yes [version 3.14159265]
               pdftops: yes [version 0.33.0]

running test
running egg_info
writing top-level names to lib/matplotlib.egg-info/top_level.txt
writing lib/matplotlib.egg-info/PKG-INFO
writing dependency_links to lib/matplotlib.egg-info/dependency_links.txt
writing requirements to lib/matplotlib.egg-info/requires.txt
writing namespace_packages to lib/matplotlib.egg-info/namespace_packages.txt
reading manifest file 'lib/matplotlib.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'lib/matplotlib.egg-info/SOURCES.txt'
running build_ext
copying build/lib.linux-x86_64-3.4/matplotlib/ft2font.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_png.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_image.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/ttconv.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_path.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_cntr.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_contour.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_delaunay.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_qhull.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/_tri.cpython-34m.so -> lib/matplotlib
copying build/lib.linux-x86_64-3.4/matplotlib/backends/_tkagg.cpython-34m.so -> lib/matplotlib/backends
copying build/lib.linux-x86_64-3.4/matplotlib/backends/_backend_agg.cpython-34m.so -> lib/matplotlib/backends
..
----------------------------------------------------------------------
Ran 2 tests in 10.479s

OK

[tacaswell]

Merging as pep8 fails again.