• tweak some parse error messages and their positions
• fix :not() parsing and selector groups in :not() is supported now (#215)
• needPosition parser option is deprecated, positions option should be used instead (needPosition is used still if positions option omitted)
• expose internal AST API as csso.internal.*
• minify() adds sourcesContent by default when source map is generated
• bring back support for node.js 0.10 until major release (#275)