Add options to contact.getById

[shhac]

Why:

• contacts.getById pre-this-branch only takes id, but per Hub Spot spec there are more options that can go into the URL query string (as it is a GET)

This change addresses the need by:

• https://github.com/MadKudu/node-hubspot/issues/162

---

NOTES:

• Not sure how we'd test the specifics with the current mock implementation
• Haven't actually tried this change against HubSpot

[pcothenet]

@shhac finally getting back to this repo. Can you check the conflicts on this PR?

[vkhomiv-hubspot]

Conflicts are resolved here: https://github.com/MadKudu/node-hubspot/pull/203