Add nascent version of the mod detail page

* Create a nascent version of the mod detail page
* Make the slug mandatory for Mod instead of name, and load the name
  from the data file
* Make the Feedback view universal on all pages
* Refactor the use of mod pack to have a single global object at the
  router level which is shared between pages. Further, make this one
  object load itself immediately and have it automatically load any
  activated mod version
* Refactor the use of Storage related to mod pack versions into the
  router as well.
* Add trace logging back in for events, but allow individual classes
  to suppress it (as opposed to actually supressing the events)
* Fix a bug in ModVersion.eachItem where it would suggest so-called
  items which are merely registered slugs without associated items

src/pages/index.jade

@@ -10,9 +10,6 @@ extends ./layouts/basic
 append styles
     link(rel="stylesheet", type="text/css", href="/css/jquery-ui.css")
 
-prepend body
-    .view__feedback
-
 block content
     .page
 

src/pages/layouts/basic.jade

@@ -19,6 +19,7 @@ html
 
     body
         block body
+            .view__feedback
             .view__screen
             .content
                 include ../includes/_header.jade