JSON Index: Support multiple commands in hash by separating with slashes.

Also generalize Header.hashScroll to support scrolling to last item in list
as well as scrolling to non-post elements.

src/General/Header.coffee

@@ -427,10 +427,9 @@ Header =
     return if e.state
     history.replaceState {}, '' unless history.state
 
-    hash = @location.hash[1..]
-    return unless /^\d*p\d+$/.test(hash) and (post = $.id hash)
-    return if !post.getBoundingClientRect().height
-    $.queueTask -> Header.scrollTo post
+    hash = location.hash.match /[^#/]*$/
+    if (el = $.id hash) and el.offsetParent # not hidden
+      $.queueTask -> Header.scrollTo el
 
   scrollTo: (root, down, needed) ->
     if down

src/General/Index.coffee

@@ -284,20 +284,21 @@ Index =
   processHash: ->
     # XXX https://bugzilla.mozilla.org/show_bug.cgi?id=483304
     hash = location.href.match(/#.*/)?[0] or ''
-    command = hash[1..]
     state =
       replace: true
-    if command in ['paged', 'infinite', 'all-pages', 'catalog']
-      state.mode = command.replace /-/g, ' '
-    else if command is 'index'
-      state.mode = Conf['Previous Index Mode']
-      state.page = 1
-    else if /^s=/.test command
-      state.search = decodeURIComponent(command[2..]).replace(/\+/g, ' ').trim()
-    else
-      state.hash = hash
+    commands = hash[1..].split '/'
+    for command, i in commands
+      if command in ['paged', 'infinite', 'all-pages', 'catalog']
+        state.mode = command.replace /-/g, ' '
+      else if command is 'index'
+        state.mode = Conf['Previous Index Mode']
+        state.page = 1
+      else if /^s=/.test command
+        state.search = decodeURIComponent(command[2..]).replace(/\+/g, ' ').trim()
+      else if i is commands.length - 1
+        state.hash = if command then "##{command}" else ''
     Index.pushState state
-    !state.hash?
+    hash isnt state.hash
 
   pushState: (state) ->
     {search, hash, replace} = state