made 'byClass' and 'byTag' always return array, 'byTag' now removes non-elements earlier, removed SKIP_NON_ELEMENTS from compiled function since now only elements are passed to compiled functions
made 'byClass' and 'byTag' always return array, 'byTag' now removes non-elements earlier, removed SKIP_NON_ELEMENTS from compiled function since now only elements are passed to compiled functions

dperini/nwmatcher,dperini/nwmatcher,dperini/nwmatcher