fsv: 0.9.1 - 3D File System Visualizer

Adding formula for `fsv`, the 3D File System Visualizer of Jurassic Park fame (http://www.youtube.com/watch?v=J1VE6C0H2bU). Depends on `gtkglarea`, the pull request for it is https://github.com/mxcl/homebrew/pull/19160