A regexp-based CSS parser with at-rule support

Key features:

• only core dependencies
• support for nested at-rules
• tree and list structure output
• stringification (and as a consequence, de-obfuscation)
• tested against bootstrap.css, normalize.css, pure.css

I'd welcome feedback and comments. I'm especially interested to know if this group feels it's good enough to upload to CPAN, and if there is a better name I should use (see briandfoy's comment here