Add xpath and xmldom for scraping in package.json

Added xpath because zotero translators
(https://github.com/zotero/translators) frequently use xpaths.

xmldom is used as the xml engine.

Change-Id: I19ee8a5374c89973a5c8cc6348b36a14cb313204
Supplies methods to send requests to a Zotero serv

Zotero.js added to supply methods for sending req-
uests to a Zotero server.

Currently prints to screen a response body for a
given url.

Change-Id: I35df72899364fea3c1c888250fe15c2e6ef573de