Graphql language

[gforge]

Thank you for this excellent example! I finally have some grasp of this elusive cursor concept.

This pull request is about making the example a little more dense by defining the types in GraphQL. I've found this much easier to read and figured that I'd share this if anyone is interested in taking this approach. I suggest that you add a branch with this solution and perhaps a README that points explains both solutions.

Details:

• I use the babel inline import plugin for loading the graphql files
• The schema is built using graph-tools makeExecutableSchema.
• I've added some convenience helpers such as nodemon
• I've also fixed a bug in the limitQueryWithId
• I've added the missing bluebird dependency and moved all the babel stuff into dev. The latter is a matter of taste but it nicely separates (in my mind) the core pieces from the fluff

I've tested the code with two articles on my local machine. Some test-cases would perhaps be nice to have, let me know if you want me to add these.