Comment 4 for bug 1451937

From UOS yesterday:

<rschroll> QUESTION: What's the current recommendation about shipping HTML5 toolkit files? Should we include our own versions in our packages or use the system files?
<alex-abreu> rschroll, we will support both options, if you want to really control the updates cycles for your app, you can host it otherwise use the system one which will benefit from bug fixes and UI updates
<alex-abreu> rschroll, we will land a few API breaking updates in the UI and JS SDK, .. but we will make sure that they dont break the existing apps

We need to decide whether using the system theme files is supported or not. If it is, we need to avoid problems like this. If not, then there shouldn't be system them files -- we should put them automatically in each new HTML5 project. (In practice, we need to keep the existing theme files for existing apps, but it should not be updated.) I don't really care which, but we need to clarify this story.