Resolve units unrecognized by GetAlias
Resolve units unrecognized by GetAlias

Attempt to resolve https://github.com/gentooboontoo/js-quantities/issues/101 by 
adding original unit names to the list of known aliases for ["beerbarrel", "beerbarrel-imp", "oilbarrel"].
gentooboontoo/js-quantities,gentooboontoo/js-quantities,gentooboontoo/js-quantities,gentooboontoo/js-quantities