Fix broken check of results during e2e tests

[leio10]

This PR fixes a bug during E2E tests: the correctness of the results were not being checked. This prevented a bug on the results calculation on the dummy voting scheme to be catched. That bug is also fixed on this PR. Other fixes on the dummy scheme are included in the PR:

• A small typo on the JS client.
• The trustee checks for the quorum before sending the compensation.
• The voters will not use 0 as a random value for "ciphering" the values. This fixes #199.

Finally, the release process was modified to use commit messages without prefixes.

[codecov-commenter]

Codecov Report

Merging #206 (e5726db) into develop (54dd8dc) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #206      +/-   ##
===========================================
+ Coverage    69.04%   69.05%   +0.01%     
===========================================
  Files           95       95              
  Lines         1615     1616       +1     
===========================================
+ Hits          1115     1116       +1     
  Misses         500      500              

Impacted Files	Coverage Δ
...app/services/voting_scheme/dummy/bulletin_board.rb	82.95% <100.00%> (+0.19%)	:arrow_up:

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