v1.6.1

support ^ and ^^ shadow dom selectors
fix sourcemap selector (used to report end of the element or selector) and directive position (previously not supported)
fix parsing empty less files
error on (currently) ambiguous guards on multiple css selectors
older environments - protect against typeof regex returning function
Do not use default keyword
use innerHTML in tests, not innerText
protect for-in in case Array and Object prototypes have custom fields