graphql / graphql-js / 813

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[RFC] Directives in schema language

This adds directives to schema language and to the utilities that use it (schema parser, and buildASTSchema). Directives are one of the few missing pieces from representing a full schema in the schema language.

Note: the schema language is still experimental, so there is no corresponding change to the spec yet.

DirectiveDefinition :
  - directive @ Name ArgumentsDefinition? on DirectiveLocations

DirectiveLocations :
  - Name
  - DirectiveLocations | Name

Example:

```
directive @skip(if: Boolean!) on FIELD | FRAGMENT_SPREAD | INLINE_FRAGMENT

directive @include(if: Boolean!)
  on FIELD
   | FRAGMENT_SPREAD
   | INLINE_FRAGMENT
```

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