Download counts more accurate

Hello friends, ckknight here.

Previously, we haven't been tracking Curse Client downloads as something that would increment our download counters. This has now been fixed so that every download on the Curse Client will properly increment the download counters now.

Already we're seeing a _dramatic_ increase of downloads. It's really a wonderful sight to see how many users are really downloading my addons.

Note than from one refresh to the next, the download counts might not update, as there is heavy caching in place, but every download is still counted.

In no way, shape, or form are we "faking" our numbers, we try to be as accurate as possible.