Allow GitHub Enterprise domains

[JimmyMultani]

Can't take over PR #5 without being a maintainer on this repo or that PR, so I've started a new one.

This should fix #3.

• update script to read from build.domain and build.prefix
• update docs for new parameters
• update tests to read from travis ci envs

[JimmyMultani]

Hey @siddharthkp, seems like Travis CI builds are failing because of an authentication issue in Travis CI. Is that github_token env being set? Does it need to be updated?

The test.js script was also hardcoded to read only from your own repo, as opposed to the repo it resided in, so it's been updated now. New PR forks should be able to pass now if they set it up on their end.

I also noticed that the package-lock.json was out of sync from your dependency versions, so I updated it. Now the Node test on Travis CI will pass.

As an aside, I've added you as a collaborator on my fork.

[JimmyMultani]

Hey @siddharthkp, would love to hear your feedback on this.

[JimmyMultani]

@siddharthkp, it doesn't seem like this is what you're looking for. Just let me know and I'll close the request, or you can close it yourself. Thanks.