save users in postgres

[SimonLab]

ref: #46

Link comments and versions of comments to users and display avatar on history list

[codecov[bot]]

Codecov Report

Merging #99 into master will increase coverage by 0.05%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
+ Coverage   99.46%   99.51%   +0.05%     
==========================================
  Files          17       19       +2     
  Lines         186      206      +20     
==========================================
+ Hits          185      205      +20     
  Misses          1        1

Impacted Files	Coverage Δ
lib/app/version.ex	100% <ø> (ø)	:arrow_up:
lib/app/issue.ex	100% <ø> (ø)	:arrow_up:
lib/app/comment.ex	100% <ø> (ø)	:arrow_up:
lib/app_web/controllers/issue_controller.ex	100% <ø> (ø)	:arrow_up:
lib/app/helpers/issue.ex	100% <100%> (ø)	:arrow_up:
lib/app/helpers/user.ex	100% <100%> (ø)
lib/app/user.ex	100% <100%> (ø)
lib/app_web/controllers/event_type_handlers.ex	100% <100%> (ø)	:arrow_up:

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