0.5

• 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