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
@hindessm , I managed to lose your comments when overwriting the pull request's branch with my local one. I made a response on your comment about the redirect url. I deliberately decided to choose a URI that's different from our current convention as I disagree with it. The user is setting up the "redirect URL" in most frameworks. Having redirect in the URL gives confirmation to the user that they're doing the right thing. Having callback here would just confuse the user as they'll start to wonder what that means... Yes, it's a callback from OUR perspective but a redirect from the user's perspective. So I propose to change all of them to redirect. Sorry, it stays as is for the  time being!