• support for CSS Custom Properties (#279)
• rework RTBL properties merge – better merge for values with special units and don't merge values with CSS-wide keywords (#255)
• remove redundant universal selectors (#178)
• take in account !important when check for property overriding (#280)
• don't merge text-align declarations with some values (#281)
• add spaces around /deep/ combinator on translate, since it together with universal selector can produce a comment
• better keyword and property name resolving (tolerant to hacks and so on)
• integration improvements
  • compression log function could be customized by logger option for compress() and minify()
  • make possible to set initial line and column for parser