Add Ability to pass SourceJS CLI options via object

#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