graphql / graphql-js / 1127

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Refactors tokenizer to emit a Token double-linked-list

This refactors the tokenizer, simplifying both tokenizer and parser code slightly (fewer utility functions) and returns tokens as part of the AST's `loc` information. Tokens also have gained a few new properties: `line`/`column` for the 1-indexed position the token begins and `prev`/`next` to navigate the dll of Tokens. Finally, this introduces three new Token types: `<SOF>` for the empty token at beginning of the file stream, `,` for ignored comma tokens, and `Comment` for ignored comment tokens. These tokens are *included* in the Token list allowing for easier navigation of the parsed document in GraphQL tools and as a basis for parsing comment descriptions in the schema language.

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