Allow embedding of folders and access to folders to anonymous editors with edit_hash/spaceAuth links (#63)

* add subspaces to be listed with edit_hash/spaceAuth authorization

* remove dead code from api_helpers.js

* add edit_hash authorization for requested space thumbnails

* handle /s/:hash links in frontend router

* set space_auth via a function, allow passing it to load_space

* rename variable in /s/:hash router in backend

* hide search, profile, breadcrumb in folders if not logged in, construct links to subspaces differently for anonymous editors

public/javascripts/spacedeck_routes.js

@@ -17,6 +17,21 @@ var SpacedeckRoutes = {
           }.bind(this)
         }
       ]);
+      
+      this.router.add([
+        {
+          path: "/s/:hash",
+          handler: function(params, on_success) {
+            var parts = params.hash.split("-");
+            if (path.length > 0) {
+              this.load_space(parts.slice(1).join("-"), on_success, null, parts[0]);
+            } else {
+              // FIXME error handling
+              on_success();
+            }
+          }.bind(this)
+        }
+      ]);
 
       this.router.add([
         {