Editor: cannot upload .appdf with jpeg

[oorlov]

From Aptoide:

While generating appDFs on the editor we were able to make appDFs with jpg images. And then we were unable to upload them as jpg isn't a valid format.
We were running the Editor on Firefox 24.0 under Caixa Magica 20 (Ubuntu 13.10)

jpeg is acceptable, so need also to update .xsd