Ability to specify which services to allow embedding to?

Hi, I've read through the documentation, and for my product that I'd like to use EmbedBox with, we only support a subset of platforms that EmbedBox supports, so it doesn't make sense to show embed codes for them (for instance, for legal reasons)

Is it as simple as just doing:

```
EmbedBox.fetchedTargets = ['wordpress', 'drupal', 'generic' ]
```

After loading the embedbox script to specify which targets we support? This seems to not be clearly documented, or I'm missing it.