0.5.0

[stephencelis]

• Added: New result builder syntax for creating parsers! Use the Parse and OneOf entry points into @ParserBuilder and @OneOfBuilder blocks.
• Added: A Peek parser: for running a parser and checking its result without consuming input (thanks @randomeizer).
• Added: A Not parser: for running a parser and succeeding if it fails (or failing if it succeeds) (thanks @randomeizer).
• Changed: Many parsers have been updated to work with builder syntax, including Skip, Many, etc.
• Changed: Int.parser() now takes an Int (not Self) as its radix.
• Performance: Many's performance has been improved.

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This discussion was created from the release 0.5.0.