Add Loggable

[renatomassaro]

Depends on #271

Closes #278

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• Docs

TODO:

• Remove repeated handler entries on HELF.Event all_events (cf Add 'all_events' catch-all to HELF.Event HELF#26)

Incidental:

• Updated some dependencies. Work remaining for Update dependencies; add HexPM dependency-tracker badge #282
• Renamed Log and LogRevision models inserted_at to creation_time
• Refactored Network events to follow the new format

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This change is 

[renatomassaro]

Reviewed 23 of 24 files at r1, 4 of 4 files at r2.
Review status: all files reviewed at latest revision, 2 unresolved discussions, some commit checks broke.

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lib/log/model/loggable/flow.ex, line 154 at r2 (raw file):

  database, emitting the relevant `LogCreatedEvent`
  """
  def save([]),

Move the save/1 function to the EventHandler, so it stays out of the model.

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test/log/event/handler/log_test.exs, line 24 at r2 (raw file):

    @tag :pending
    test "creates log"
  end

Review this, I think it's on another scope / already tested

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Comments from Reviewable

[renatomassaro]

Reviewed 53 of 54 files at r3.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[sourcelevel-bot]

Ebert has finished reviewing this Pull Request and has found:

• 2 possible new issues (including those that may have been commented here).
• 9 fixed issues! 🎉

You can see more details about this review at https://ebertapp.io/github/HackerExperience/Helix/pulls/281.

[renatomassaro]

Reviewed 1 of 1 files at r4.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable