travis: upgrade pip and use wheels
travis: upgrade pip and use wheels

tomaaron/raiden,tomashaber/raiden,tomashaber/raiden,tomaaron/raiden,tomashaber/raiden,hackaugusto/raiden,hackaugusto/raiden,tomaaron/raiden,tomashaber/raiden,tomashaber/raiden,charles-cooper/raiden,charles-cooper/raiden,tomaaron/raiden