localization and dep changes

[hanorine]

When cloning this repo and installing dependencies, the entire OscarYuen/go-graphql-starter is downloaded unnecessarily into vendor. By removing this dependency and having the project look for the packages locally, then changes can be gradually introduced and the project starter can be used to build as one cohesive project. Otherwise, it will be necessary to continually update the online repo and then pulling those changes to local vendor folder.

Build in Golang context can now be imported simply as "context", the changes reflect this.

The dataloader package has been since included into graph-gophers and import reflects this as well.

I have run the graphiql and verified that setup with PostgresQL db works accordingly.

It is best to try out the changes before merging to master.

I hope this can better illustrate for new comers how to properly utilize the graph-gophers implementation in an updated version. Example applications can better serve if they reflect current versions.

[OscarYuen]

@JaysQubeXon Thanks for contribution. I would help take a look on this very soon :)