Jsmin

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- Breaking Change: Removed support for Python 2

- Removed usage of use_2to3 in setup.py

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- Add license headers to code files (fixes i17)

- Remove mercurial files (fixes 20)

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- Fix 14: Infinite loop on `return x / 1;`

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- Merge 13: Preserve "loud comments" starting with `/*!`

These are commonly used for copyright notices, and are preserved by various
other minifiers (e.g. YUI Compressor).

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- Fix 12: Newline following a regex literal should not be elided.

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- Fix 9: Premature end of statement caused by multi-line comment not
adding newline.

- Fix 10: Removing multiline comment separating tokens must leave a space.

- Refactor comment handling for maintainability.