fix: testing for non-developer installation

[mgxd]

Addon to #2252 , fixes #2108 .

Changes proposed in this pull request

• moves testing config files insides nipype directory and includes them during installation
• minor fixes to included test data that was incompatible with setuptools 20.7.0 - Ubuntu 16.04 default

should allow testing through nipype.test() again

[codecov-io]

Codecov Report

Merging #2280 into master will decrease coverage by 5.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2280      +/-   ##
==========================================
- Coverage   72.52%   67.49%   -5.04%     
==========================================
  Files        1188     1189       +1     
  Lines       59143    59151       +8     
  Branches     8510     8510              
==========================================
- Hits        42892    39922    -2970     
- Misses      14866    18153    +3287     
+ Partials     1385     1076     -309

Flag	Coverage Δ
#smoketests	67.49% <100%> (-5.04%)	⬇️
#unittests	64.97% <100%> (-5.17%)	⬇️

Impacted Files	Coverage Δ
nipype/conftest.py	100% <100%> (ø)
nipype/workflows/graph/__init__.py	0% <0%> (-100%)	⬇️
nipype/workflows/fmri/spm/tests/__init__.py	0% <0%> (-100%)	⬇️
nipype/interfaces/minc/testdata.py	0% <0%> (-100%)	⬇️
nipype/sphinxext/__init__.py	0% <0%> (-100%)	⬇️
...pype/workflows/dmri/camino/connectivity_mapping.py	7.51% <0%> (-92.49%)	⬇️
...pype/workflows/dmri/mrtrix/connectivity_mapping.py	7.76% <0%> (-92.24%)	⬇️
nipype/workflows/dmri/camino/diffusion.py	11.11% <0%> (-88.89%)	⬇️
nipype/workflows/dmri/mrtrix/diffusion.py	6.32% <0%> (-87.35%)	⬇️
nipype/workflows/smri/freesurfer/ba_maps.py	11.11% <0%> (-79.17%)	⬇️
... and 84 more

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[satra]

merging this but @djarecka - was looking for an option via nipype.test.

[djarecka]

@satra yes, I started looking and wasn't sure if we changed the concept. should I still work on it or we will use this pr?

[djarecka]

@mgxd : I misunderstood @satra , I don't work on nipype.test anymore, we agreed that moving pytest files is better.