(Feature) Add tests and coverage to notifyRegTx controller

[garatortiz]

Before submitting a pull request, please provide the following information:

• What is it? (leave one option)

  • New (Feature) implementation

• What was the root cause of the problem originally / what feature was missing?

  • Adds tests and coverage
  • Refactor notify controller and route
  • Creates some extra libraries

• How does this pull request solve it (in broad terms)? Add tests and coverage

• Does it close any open issues? Closes #38

• Quick checklist

  • [x] eslint shows no errors

    cd web-dapp
    eslint .

  • [x] docs were updated where necessary OR they don't need to be updated
  • [x] tests were updated where necessary OR they don't need to be updated

• Additional information

[coveralls]

Pull Request Test Coverage Report for Build 50

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• 11 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+12.5%) to 19.949%

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Files with Coverage Reduction	New Missed Lines	%
routes/notify_reg_tx.js	11	0.0%
<!--	Total:	11		-->

Totals
Change from base Build 46:	12.5%
Covered Lines:	179
Relevant Lines:	879

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💛 - Coveralls