Pyhaml

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- Implement parsing of literal star-args and star-kwargs, restoring ability to
use alternative method of Python keywords in Mako tags.

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- Python 3 compatibility.

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- Fix use of parenthesis within strings in tag attributes (e.g. `%a(name=":)")`).
- Fix use of colons within control statements (e.g. either colon in `if x[-1:] == ':':`).
- Above fixes allow for multiline statements when parenthesis are present,
just like normal Python.

Notes: templates which triggered fixed bugs would result in syntax errors, we
are not classifying these are breaking backwards compatibility, and so this is
only a minor bump.

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- Fix parsing of nesting control structures; `else` would not function properly in a nested structure.

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- Switched to [SemVer](http://semver.org/); no changes here.

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- Added `!!! 5` support without putting the engine into HTML mode.
- Fixed a repr bug in HTMLComment.
- No longer process camel case in Mako tags.