Added way to test the embedder
Fix embedder media compilation.

For some reason using the closure compiler wasn't working.  Switched
to simply concatinating the files like we do with the subtitle editor
and things seem to work again.

Fix for the include_bundle tag to work with the embedder JS.

I don't really understand this code at all, it seems like it could use
a big cleanup to me.
One more fix for the transcript viewer demo

Added bootloader code to the non-closure JS compilation and made the
embedder use it.

Made embedder-offsite.html load the JS url from the current instance,
rather than hardcoding an S3 URL.

Got rid of embedder-offsite-test, we can just use embedder-offsite
now.