EMSC: __eq__ and __hash__

[markotoplak]

Fixes #662

[codecov]

Codecov Report

Merging #697 (baf3156) into master (1cbe659) will decrease coverage by 0.01%.
Report is 6 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head baf3156 differs from pull request most recent head 0636def. Consider uploading reports for the commit 0636def to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #697      +/-   ##
==========================================
- Coverage   88.76%   88.75%   -0.01%     
==========================================
  Files          73       73              
  Lines       12546    12546              
==========================================
- Hits        11136    11135       -1     
- Misses       1410     1411       +1     

[markotoplak]

I am merging this so that it gets tested better. :)