Multiclass nets

[jshermeyer]

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Description

Adding more models to the model zoo and the ability to create multiclass outputs.

Fixes # 45

Type of change

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected - these changes will not be merged until major releases!)

How Has This Been Tested?

Please describe tests that you added to the pytest codebase (if applicable).

Checklist:

• [x] My PR has a descriptive title
• [x] My code follows PEP8
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new errors
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] My PR passes Travis CI tests
• [ ] My PR does not reduce coverage in Codecov

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[codecov[bot]]

Codecov Report

Merging #379 into dev will decrease coverage by 1.21%. The diff coverage is 16.66%.

@@            Coverage Diff             @@
##              dev     #379      +/-   ##
==========================================
- Coverage   57.97%   56.75%   -1.22%     
==========================================
  Files          79       80       +1     
  Lines        6603     6806     +203     
==========================================
+ Hits         3828     3863      +35     
- Misses       2775     2943     +168     

Impacted Files	Coverage Δ
solaris/nets/model_io.py	17.72% <0.00%> (-0.47%)	:arrow_down:
solaris/nets/train.py	12.04% <0.00%> (-0.30%)	:arrow_down:
solaris/nets/zoo/multiclass_segmentation.py	12.83% <12.83%> (ø)
solaris/nets/datagen.py	88.74% <100.00%> (+0.46%)	:arrow_up:
solaris/nets/zoo/__init__.py	100.00% <100.00%> (ø)
solaris/nets/transform.py	62.90% <0.00%> (+0.80%)	:arrow_up:

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