Add Ability to pass SourceJS CLI options via object

[Alanoll]

#241 added the ability to use NodeJS's require to load SourceJS as part of a NodeJS script.

This issue will need to add the ability to pass in the SourceJS CLI options via plain object to the startServer method.

It should follow the same inheritance/override pattern as the current CLI ability.

1. Load Options via Options file
2. Load Options via CLI
3. Load Options via Options object
4. Override using process.env

[Alanoll]

I'm thinking something simple matching the SourceJS options file:

{ hostname: '', port: '' }

Use of commander should be inspected throughout SourceJS, to ensure passed Options are used where neccesary (Tests come to mind).

A lot of SourceJS init occurs prior to the startServer method currently. Some of this logic may need to be moved so Options are respected properly.

[Alanoll]

I don't think this issue should hold up the release of 0.6.0. I'm not sure of the full scope of changes, and they may be large enough that pushing to the next release makes sense.

[robhrt7]

Indeed, 0.6.0 just needs to be released already. But feel free to draft a PR whenever you're ready.

[Alanoll]

Just adding a note here, so I don't forget when I come back to this.

I think we should do what Norbert did in this changeset where he moved all the server logic into a server.js file. I can either wait for his PR to be accepted (post-0.6.0) or we just deal with the annoying merge.

[ndelangen]

We could cherry-pick that change into a new branch and submit a new PR?