• Breaking: Remove official node v4 support. It probably still works with node v4, but no guarantees anymore.
• Potentially breaking: Replace babel with regex-based transformation 9b77ed9a293c538ec3eb5160bcb933e012ce517f.
  This should not break, but it has been flagged as major version bump as the regex might not catch all cases reliably and thus fail for some users.
• Improve runtime performance #132
• Use coffeescript package in favor of deprecated coffee-script #134