Add automatic/fallback redirection for URLs with missing or incorrect trailing slash

assets/javascripts/app/router.coffee

@@ -66,13 +66,22 @@ class app.Router
 
   entry: (context, next) ->
     doc = app.docs.findBySlug(context.params.doc)
+    return next() unless doc
+    path = context.params.path
+    hash = context.hash
 
-    if entry = doc?.findEntryByPathAndHash(context.params.path, context.hash)
+    if entry = doc.findEntryByPathAndHash(path, hash)
       context.doc = doc
       context.entry = entry
       @triggerRoute 'entry'
       return
+    else if path.slice(-6) is '/index'
+      path = path.substr(0, path.length - 6)
+      return entry.fullPath() if entry = doc.findEntryByPathAndHash(path, hash)
     else
+      path = "#{path}/index"
+      return entry.fullPath() if entry = doc.findEntryByPathAndHash(path, hash)
+
     return next()
 
   root: ->

assets/javascripts/lib/page.coffee

@@ -53,7 +53,12 @@ page.replace = (path, state, skipDispatch, init) ->
   context = new Context(path, state or currentState)
   context.init = init
   currentState = context.state
-  page.dispatch(context) unless skipDispatch
+  result = page.dispatch(context) unless skipDispatch
+  if result
+    context = new Context(result)
+    context.init = init
+    currentState = context.state
+    page.dispatch(context)
   context.replaceState()
   updateCanonicalLink()
   track() unless skipDispatch