Preview doesn't work everywhere about oembed

[reganlawton]

This was changed due to an issue with JS errors on frontend for some users if the jquery wasn't used. I think two parts need to happen here. I think I need to refactor the jQuery out and secondly open the regex to additional areas of the admin panel

[lukasgeiter]

That doesn't really make sense though because the getIsCpRequest() check already excludes the frontend. I dug through the old issues and found issue #12 which seems to be the motivation for the regex.

The original problem is about the <script> tag being included in a JSON result. Only including assets in certain control panel areas isn't really the best fix for that. The assets should be included in all full page HTML results - or ideally only when the field itself is rendered as well.

Fortunately this is actually pretty easy to do. I've created a PR (#63) that should solve this issue along with #52.