separate grunt/gulp/bower detection

lib/failure.sh

@@ -72,9 +72,11 @@ warn_untracked_dependencies() {
   local log_file="$1"
   if grep -qi 'gulp: not found' "$log_file"; then
     warning "Gulp may not be tracked in package.json" "https://devcenter.heroku.com/articles/troubleshooting-node-deploys#ensure-you-aren-t-relying-on-untracked-dependencies"
-  elif grep -qi 'grunt: not found' "$log_file"; then
+  fi
+  if grep -qi 'grunt: not found' "$log_file"; then
     warning "Grunt may not be tracked in package.json" "https://devcenter.heroku.com/articles/troubleshooting-node-deploys#ensure-you-aren-t-relying-on-untracked-dependencies"
-  elif grep -qi 'bower: not found' "$log_file"; then
+  fi
+  if grep -qi 'bower: not found' "$log_file"; then
     warning "Bower may not be tracked in package.json" "https://devcenter.heroku.com/articles/troubleshooting-node-deploys#ensure-you-aren-t-relying-on-untracked-dependencies"
   fi
 }