Break down openbazaard.go into smaller files about openbazaar-go

[cpacia]

@tyler-smith you can give your opinion here. I'm not sure I see any logical place to break up the code as it's just initializing everything.

[tyler-smith]

Yeah almost the bulk of the code is in the server initialization. You could break out logging and command handlers to their own files but I don't think that'd be things much better. You'd still have a giant Start.Execute() that's pretty unavoidable. I don't care too much one way or another if somebody submits a PR with a good refactoring.

[cpacia]

Closing because I mostly agree with Tyler. If someone wants to submit a PR that puts some parts into a separate file I'd be open to it.