Convert parser warnings to stdout in haml_lint

So we ignore it in static-analysis when status is 0,
yet still report it if it's not.

lib/tasks/haml-lint.rake

@@ -2,5 +2,14 @@ unless Rails.env.production?
   require 'haml_lint/rake_task'
   require 'haml_lint/inline_javascript'
 
+  # Workaround for warnings from parser/current
+  # TODO: Remove this after we update parser gem
+  task :haml_lint do
+    require 'parser'
+    def Parser.warn(*args)
+      puts(*args) # static-analysis ignores stdout if status is 0
+    end
+  end
+
   HamlLint::RakeTask.new
 end