Dynamic counter of download

[namuit]

I think it's a good idea to render dynamic the number of download of Downthemall.

As I can see at https://addons.mozilla.org/it/firefox/addon/downthemall/statistics/downloads/?last=30 the extension has about 16000 download at day. In a day there are 86400 seconds, so 86400/16000 = 1 download each 5 second.

In a possibile future version, the script can update each day the values

[stefanoverna]

a little to slow to get noticed, right? :)