made a few changes and added Point type

updated imports

add raw query/mutation functions (hasura#3)

In the case we developers want to decode JSON response ourself. Moreover, the default `UnmarshalGraphQL` function isn't ideal with complicated nested interfaces

Subscription client and named operation (hasura#2)

Extend https://github.com/shurcooL/graphql library with new features:

- Subscription client
- Named operation wrappers