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[RFC] Add explicit context arg to graphql execution

This *BREAKING* change introduces a new argument to the GraphQL execution API which is presented to resolution functions: `context`.

This solves a long-standing point of confusion about the correct way to represent authentication or a "viewer context" in which a query is executed.

Previously, we suggested that the `rootValue` contain any authentication tokens, however this led to awkward code:

```
resolve: (val, args, { rootValue: { authToken } }) { ... }
```

Which can now be written as:

```
resolve: (val, args, authToken) { ... }
```

The `info` object is still created and provided to resolution functions, and the `rootValue` is still provided within it, however it is now the *fourth* argument rather than the *third*.

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