Add support for service_job_number, service_branch & service_build_url. …

[martin-walsh]

…Also align CircleCI & Travis with node-coveralls.

See:

• Handle service_job_number for parallelism in Travis and CircleCI nickmerwin/node-coveralls#290
• https://github.com/nickmerwin/node-coveralls/blob/master/lib/getOptions.js#L25
• https://github.com/nickmerwin/node-coveralls/blob/master/lib/getOptions.js#L55

The variables service_job_number, service_branch & service_build_url have been confirmed to exist by coveralls support. They are as yet undocumented. Some are also in use in the various coveralls libs for node etc.

I have confirmed the service_build_url variable does render a link back to build on coveralls UI

[coveralls]

Pull Request Test Coverage Report for Build #53

• 28 of 28 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build #51:	0.0%
Covered Lines:	263
Relevant Lines:	263

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💛 - Coveralls

[martin-walsh]

[nbaztec]

Thanks for the contribution. I'll take a look after this week, since I'm away from my PC at the moment.