Login as trial user

[daniyarchambylov]

@fgimenez I didn't add trial user authentication here yet. It will be done in separate PR. For now login with userId is treated same way ethAddress is. When trial userId will be provided I will also add changes to accept empty password and Client instantiation with no params.

[daniyarchambylov]

@fgimenez you said that we already can create object with const client = new armlet.Client() but I don't see changes that would allow it https://github.com/ConsenSys/armlet/blob/master/index.js#L14 If you have those changes which branch is it? Or I can do it myself :)

[rocky]

@daniyarchambylov @fgimenez let's hold off on merging this until after release 1.0.0. It doesn't look like a bug fix but an improvement. And it will be coordinated with other improvements that we will need in truffle-analyze.

[daniyarchambylov]

changed base branch for PR. It shouldn't affect master branch @rocky @fgimenez

[daniyarchambylov]

@fgimenez I see your point. If we'll use userIid for trial user authentication then there is no need to pass userId. I'll fix PR

[coveralls]

Pull Request Test Coverage Report for Build 176

• 11 of 11 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 98.258%

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Totals
Change from base Build 168:	0.07%
Covered Lines:	193
Relevant Lines:	194

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💛 - Coveralls