(Improvement) Use winston as logger

[garatortiz]

• What is it? (leave one option)

  • (Improvement) of existing functionality

• What was the root cause of the problem originally / what feature was missing? The 'console' has not the possibility to manage multiples transports and levels.

• How does this pull request solve it (in broad terms)? Replace console with winston.

• Does it close any open issues? Closes #57

• 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 85

• 6 of 8 (75.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 23.831%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
web-dapp/server-lib/logger.js	6	8	75.0%
<!--	Total:	6	8	75.0%	-->

Totals
Change from base Build 82:	0.2%
Covered Lines:	237
Relevant Lines:	980

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💛 - Coveralls