Change AutoContrasts to DummyContrasts. Fixes #52

[adelavega]

Fixes #52

[codecov-io]

Codecov Report

Merging #53 into master will decrease coverage by 0.38%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master   #53      +/-   ##
=======================================
- Coverage   93.39%   93%   -0.39%     
=======================================
  Files          16    16              
  Lines         469   472       +3     
=======================================
+ Hits          438   439       +1     
- Misses         31    33       +2

Impacted Files	Coverage Δ
pyns/models/analysis.py	85.6% <ø> (ø)	⬆️
tests/test_analysis.py	100% <100%> (ø)	⬆️
tests/test_dataset.py	100% <100%> (ø)	⬆️
pyns/models/utils.py	72.22% <33.33%> (-7.78%)	⬇️

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