Split out the individual download panels.
Update Gentoo download panel.
Update Arch download panel.
Move Desura from a platform to a link, and add Lutris.
Split out and update separate Fedora and openSUSE panels.
Tweak windows / OS X / Ubuntu panels.
Reorganize the section ordering.
Add FreeBSD platform.
Remove redundant css class.
Update for review comments.
Update openSUSE instructions with further review feedback.
Merge pull request #172 from pchote/download-platforms

Overhaul the downloads page