- Update for spec changes
- Add a `ast.WhitespaceToken.value` attribute to `ast.WhitespaceToken`
- Breaking change: CSS comments are now preserved as `ast.Comment` objects by default. Pass `skip_comments=True` to parsing functions to get the old behavior
- Breaking change: Top-level comments and whitespace are now preserved when parsing a stylesheet, rule list, or declaration list. Pass `skip_comments=True` and `skip_whitespace=True` to get the old behavior
- Test on Python 3.4 and PyPy3
- Set up continous integration on Travis-CI