use public URL for pub_cache dep
use public URL for pub_cache dep

jakemac53/dartdoc,dart-lang/dartdoc,a14n/dartdoc,d2m/dartdoc-2015,jakemac53/dartdoc,a14n/dartdoc,dart-lang/dartdoc,jakemac53/dartdoc,astashov/dartdoc,jakemac53/dartdoc,d2m/dartdoc-2015,d2m/dartdoc-2015,dart-lang/dartdoc,d2m/dartdoc-2015,keertip/dartdoc,dart-lang/dartdoc,astashov/dartdoc,astashov/dartdoc,srawlins/dartdoc,keertip/dartdoc,srawlins/dartdoc,keertip/dartdoc,keertip/dartdoc,a14n/dartdoc,srawlins/dartdoc,astashov/dartdoc,srawlins/dartdoc