Version sorting

[bfcns]

I would like to thank you for your efforts to put this online.

It would be great if the sorting of versions is descending and by the dot of the app versions.

[lazamar]

This is just a matter of adding the required JavaScript to the versions page.
I'm marking this as a good first issue for prospective contributors.

[dfandrich]

The user experience would be improved IMHO by sorting them so the newest ones are at the top by default, since most people are going to be interested in recent versions which could otherwise require some scrolling. Such a default can easily be done server-side without resorting to Javascript.