Fixed warning: needed user_id for playcall.
Tomed down browser number of items.
Default transcode for upload and play.

- After an upload a default transcode can be started.
- A play request first tries to play a default transcode profile,
  if it cannot find one, it tries an mediafile.
Added webm mimetype.
Small changes to the MediaBrowser views.
Fixes wysiwyg viewing of video's.
Added More allowed file types and merged with media allowed filetypes.
Start default ck transcode if set, after upload.
Fixed typo in menu callbacks.