Use placeholder images for item groups

src/scripts/controllers/image_loader.coffee

@@ -13,8 +13,10 @@ module.exports = class ImageLoader
 
     constructor: (options={})->
         options.defaultUrl   ?= null
-        options.onLoading    ?= -> @hide()
-        options.onLoad       ?= -> @show()
+
+        if not options.defaultUrl?
+            options.onLoading ?= -> @hide()
+            options.onLoad    ?= -> @show()
 
         @defaultUrl = options.defaultUrl
         @onLoading  = options.onLoading
@@ -22,6 +24,10 @@ module.exports = class ImageLoader
 
         @_images = {}
 
+        if @defaultUrl
+            @_defaultImage = new Image
+            @_defaultImage.src = @defaultUrl
+
     # Class Methods ################################################################################
 
     @load: (imageUrl, $el, options={}) ->
@@ -48,7 +54,11 @@ module.exports = class ImageLoader
         if data.isLoaded
             @_loadImageIntoElement data.imageUrl, $el
         else
-            $el.removeAttr 'src'
+            if @defaultUrl?
+                $el.attr 'src', @defaultUrl
+            else
+                $el.removeAttr 'src'
+
             if data.elements.indexOf($el) is -1 then data.elements.push $el
 
         return this

src/scripts/controllers/mod_page_controller.coffee

@@ -129,7 +129,7 @@ module.exports = class ModPageController extends BaseController
             $link.slideDown duration:Duration.normal
             $link.attr 'href', url
         else
-            $link.sludeUp duration:Duration.normal
+            $link.slideUp duration:Duration.normal
 
     _refreshVersions: ->
         @$versionSelector.empty()