Fixed a memory allocation bug in MultiSetCooccurrenceVectorizer adde…

[jc-healy]

…d a small unit test to catch the memory error.

[lmcinnes]

Seems i need to fix something in the list based Wasserstein vectorizer code ...

[codecov-commenter]

Codecov Report

Merging #119 (dff6648) into master (b0c2fed) will increase coverage by 0.07%. The diff coverage is 80.95%.

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@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   91.15%   91.23%   +0.07%     
==========================================
  Files          34       34              
  Lines        4849     4869      +20     
==========================================
+ Hits         4420     4442      +22     
+ Misses        429      427       -2     

Impacted Files	Coverage Δ
vectorizers/multi_token_cooccurence_vectorizer.py	96.85% <73.33%> (-3.15%)	:arrow_down:
vectorizers/tests/test_common.py	99.82% <100.00%> (+<0.01%)	:arrow_up:
vectorizers/tests/test_signature_vectorizer.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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