More naming cleanup of syntax::ast types.#7903

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michaelwoerister wants to merge 2 commits intorust-lang:masterfrom

michaelwoerister:end_of_spanned

Commits on Jul 22, 2013

Ast spanned<T> refactoring, renaming: crate, local, blk, crate_num, crate_cfg.
michaelwoerister
committed
De-spanned<T> and renamed ast::field (now ast::Field)
michaelwoerister
committed