Errors if POMs don't include plugins that poms they attach use

[NullTerminator]

Describe the bug
When a pom attaches another that uses a plugin with Javascript the browser throws errors because the Javascript doesn't get included.

To Reproduce

Voom::Presenters.define(:some_pom) do
  plugin :some_plugin_with_js
end

Voom::Presenters.define(:another) do
  attach :some_pom
end

Render :another in browser and there will be a Javascript undefined error. Currently including the plugin in :another loads the files and clears the error, but this isn't ideal.

Expected behavior
The POM renders clean. JS from atached pom's plugins is included.