Constrained sparsemax and softmax

[jankrepl]

Closes #36

[codecov]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #37   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines         1517      1557   +40     
=========================================
+ Hits          1517      1557   +40     

Impacted Files	Coverage Δ
deepdow/layers/__init__.py	100.00% <100.00%> (ø)
deepdow/layers/allocate.py	100.00% <100.00%> (ø)

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