[wip]Instagram node

This is my attempt on the Instagram node. Current example is showing the query node. Comments are welcome. I'll squash commits once we get this work into a pullable state. Thanks

The pull request is now ready @knolleary .
@knolleary, marked my node as WIP again as it looks like this.warn is a bad choice for the auth process as it's <code>this</code> is undefined at this point! Noticed this when writing nock tests!

I think a more appropriate error message would be maybe to send a warning to <code>res.send()</code>. I'll fix this.