[MRG] switch to pytest

[pavanramkumar]

closes #256

[jasmainak]

@pavanramkumar make sure to update the Makefile and all relevant docs as well (contributing.md etc.)

[codecov-io]

Codecov Report

Merging #257 into master will increase coverage by 14.13%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #257       +/-   ##
===========================================
+ Coverage   59.44%   73.58%   +14.13%     
===========================================
  Files           7        4        -3     
  Lines        1339      617      -722     
  Branches      262      124      -138     
===========================================
- Hits          796      454      -342     
+ Misses        473      123      -350     
+ Partials       70       40       -30

Impacted Files	Coverage Δ
pyglmnet/pyglmnet.py	79.46% <0%> (ø)	:arrow_up:
pyglmnet/externals/six.py
pyglmnet/externals/funcsigs.py
pyglmnet/externals/__init__.py

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[jasmainak]

@pavanramkumar ready to merge?

[pavanramkumar]

@jasmainak

• are you sure that python setup.py develop is the way to go here?
• any changes to be made in documentation before we merge?

[pavanramkumar]

• seems python setup.py develop is ok for virtualenvs such as travisCI environment: https://stackoverflow.com/questions/19048732/python-setup-py-develop-vs-install
• i also edited the developer docs to use pytest

merging.

[jasmainak]

@pavanramkumar : this still needs to be updated: https://github.com/glm-tools/pyglmnet/blob/master/Makefile#L5

[jasmainak]

regarding using python setup.py develop, it's what we use in the other packages. Maybe the regular install may also work. It was just to debug -- as I thought maybe Travis caches your installation.