Rename ast::Purity and ast::Impure Function. Closes #7287#13371

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kaseyc wants to merge 1 commit intorust-lang:masterfrom kaseyc:Rename_Purity

Commits on Apr 9, 2014

Renamed ast::Purity to ast::FnStyle and ast::ImpureFn to ast::NormalFn and updated associated variable and function names.
kaseyc
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