New download link

This just pretties up the folder that you receive when downloading from the website.

In the case of a release (v1.1.0 for example), the `/archive/` file spits out a nice folder named `fireshell-1.1.0` instead of a folder called `toddmotto-fireshell-2cd313b` that you get from the `/zipball/` link.

This also makes everyone remember to add a new tag for every release for the download link.