Name Conflicts for Beta Releases

Following the Apple model of beta releases, where you can release multiple build numbers under the same short version, UpdateServer doesn't work.

All builds are copied as <App Name>.<shortVersion>. When copying a second build of the same short version the name will conflict. This makes sense for final releases (you only want one "real" version).

Maybe betas should be copied as <App Name>.<shortVersion>-beta.<version>?