Add ComputeIdealPoint attribute

[odow]

Closes #95

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.07%. Comparing base (af5eb49) to head (b0aad37).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
+ Coverage   99.06%   99.07%   +0.01%     
==========================================
  Files           9        9              
  Lines         962      975      +13     
==========================================
+ Hits          953      966      +13     
  Misses          9        9              

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