Restore travis builds

[cmungall]

Should run within pyvenv

[cmungall]

This is quite tricky, perhaps because of scipy dependency

Processing scipy-0.19.0.zip
Writing /tmp/easy_install-1wagn_gi/scipy-0.19.0/setup.cfg
Running scipy-0.19.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-1wagn_gi/scipy-0.19.0/egg-dist-tmp-ff_9yxm1
/tmp/easy_install-1wagn_gi/scipy-0.19.0/setup.py:323: UserWarning: Unrecognized setuptools command, proceeding with generating Cython sources and expanding templates
  warnings.warn("Unrecognized setuptools command, proceeding with "
/home/travis/virtualenv/python3.5.2/lib/python3.5/site-packages/numpy/distutils/system_info.py:1532: UserWarning: 
    Atlas (http://math-atlas.sourceforge.net/) libraries not found.
    Directories to search for the libraries can be specified in the
    numpy/distutils/site.cfg file (section [atlas]) or by setting
    the ATLAS environment variable.
  warnings.warn(AtlasNotFoundError.__doc__)
/home/travis/virtualenv/python3.5.2/lib/python3.5/site-packages/numpy/distutils/system_info.py:1543: UserWarning: 
    Lapack (http://www.netlib.org/lapack/) libraries not found.
    Directories to search for the libraries can be specified in the
    numpy/distutils/site.cfg file (section [lapack]) or by setting
    the LAPACK environment variable.
  warnings.warn(LapackNotFoundError.__doc__)
/home/travis/virtualenv/python3.5.2/lib/python3.5/site-packages/numpy/distutils/system_info.py:1546: UserWarning: 
    Lapack (http://www.netlib.org/lapack/) sources not found.
    Directories to search for the sources can be specified in the
    numpy/distutils/site.cfg file (section [lapack_src]) or by setting
    the LAPACK_SRC environment variable.
  warnings.warn(LapackSrcNotFoundError.__doc__)
Running from scipy source directory.
non-existing path in 'scipy/integrate': 'quadpack.h'
error: no lapack/blas resources found

One option is a limited install and don't run any tests that depend on scipy

[cmungall]

May be related: Planteome/biolink-api#2 (comment)

[cmungall]

We probably want to do this: travis-ci/travis-ci#2650 (comment)

[cmungall]

arghh, can't persuade travis to come back on

but it refuses to trigger jobs

[cmungall]

Filed a bug: travis-ci/travis-ci#8142

[cmungall]

OK, travis issue fixed.

Now seems to be getting stuck installing pandas...

[cmungall]

May be useful http://sburns.org/2014/03/28/faster-travis-builds.html