Add graphql and graphql-tag dependencies

[mizzao]

When standing up this app from a clean checkout the graphql and graphql-tags dependencies were missing.

This is the result of doing meteor npm i --save graphql graphql-tags, and the app works after that.

Might I even suggest tossing out package-lock.json for a demo app like this? It just creates a lot of garbage for something that doesn't really require strict dependencies.

[mizzao]

Looks like #21 covers this as well.