[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 .
I decided not to do that because I wasn't sure if we're ever going to change the way nodes are re-initialized when their configuration is/has changed. So I believe the "fetch everything" approach is more robust and future proof. Otherwise if we ever edit the node initialization globally, we might fail fixing these little details in the nodes. I'd be personally happier with my approach, given my thoughts.