chore(bower/npm): use npm (not yarn) to publish

yarn has an annoying behaviour in that it wants to do the version bumping
for you and requires an interactive terminal to tell it what version.

Author: petebacondarwin

scripts/bower/publish.sh

@@ -99,7 +99,7 @@ function publish {
     # don't publish every build to the npm repository
     if [ "${NEW_VERSION/+sha}" = "$NEW_VERSION" ] ; then
       echo "-- Publishing to the npm repository as $DIST_TAG"
-      yarn publish --tag=$DIST_TAG
+      npm publish --tag=$DIST_TAG
     fi
 
     cd $SCRIPT_DIR