Remove graphql dependency entirely

[stubailo]

Success:

➜  apollo-client git:(no-graphql-dep) tree node_modules | grep graphql
├── graphql-tag

Should resolve #261 and #163

This is to work around graphql/graphql-js#414

Thanks for @abhiaiyer91's work on bundling in the dependency into graphql-tag.

TODO:

• Update CHANGELOG.md with your change
• Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass