Add RandomWeighting algorithm

[odow]

Closes #125

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.71%. Comparing base (21b42d7) to head (badc12a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   98.66%   98.71%   +0.05%     
==========================================
  Files           9       10       +1     
  Lines         972     1011      +39     
==========================================
+ Hits          959      998      +39     
  Misses         13       13              

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