Appended a trailing slash to the links for dermis, backbone_marionette, thorax.

I noticed this when I was running todomvc locally with nodeapps' http-server. When I'd click on the link for http://localhost:8080/labs/architecture-examples/thorax, it wouldn't redirect the browser to http://localhost:8080/labs/architecture-examples/thorax/, which caused a 404 for the resources that are referenced relatively. I noticed that most of the framework links on the homepage contain the trailing slash so I added a few that were missing.