Qualify all item slugs to the mod which adds them #53

* Change default item URL to fall under /mod/<mod slug>/<item slug>
  but kept the old URL pattern around with the old behavior (i.e.,
  find the first item with that slug)
* Update Item to have a `qualifiedSlug` property which combines the
  item's own slug with its Mod's slug.  Updated a lot of code all
  over to use this in preference to the plain slug.
* Add a `localizeTo` method to Inventory to allow non-qualified slugs
  to be converted into qualified slugs within the inventory's stacks
* Update ModPack to work with either qualified or unqualified slugs
  for relevant methods
* Fix model state changes to happen before related events are
  triggered
* Add a debounce to the CraftingPlan object when triggering a recraft
  due to changes in related objects (esp. its inventories)
* Update the Inventory's sort to keep items sorted by mod before name
  with the Minecraft items sorted to the top
* Fix `ModPack.findItemByName` to actually recursively use the Mod's
  method instead of slugifying the given name and looking for the
  slug (since this won't necessarily work anymore).
* Ensure each Mod is assigned a reference to its containing ModPack
* Fix NameFinder to only consider an item non-gatherable if it is
  also craftable
* Update ModVersionParserV1 to assign qualified slugs to recipes
  for any items which are in the same mod (leaving any other slugs
  unqualified)
* Add Underscore mixins for composing and decomposing slugs
* Update old tests for the use of qualified slugs, and some new tests
  for the new methods added

src/scripts/crafting_guide_router.coffee

@@ -57,10 +57,11 @@ module.exports = class CraftingGuideRouter extends Backbone.Router
         @_recordPageView()
 
     routes:
-        '':                 'root'
-        'item/:itemSlug':   'item'
-        'crafting/(:text)': 'crafting'
-        'mod/:modSlug':     'mod'
+        '':                       'root'
+        'item/:itemSlug':         'item'
+        'crafting/(:text)':       'crafting'
+        'mod/:modSlug':           'mod'
+        'mod/:modSlug/:itemSlug': 'modItem'
 
     # Route Methods ################################################################################
 
@@ -69,7 +70,12 @@ module.exports = class CraftingGuideRouter extends Backbone.Router
         controller.model.params = inventoryText:text
         @_setPage 'crafting', controller
 
-    item: (slug)->
+    item: (itemSlug)->
+        controller = new ItemPageController _.extend {itemSlug:itemSlug}, @_defaultOptions
+        @_setPage 'item', controller
+
+    modItem: (modSlug, itemSlug)->
+        slug = _.composeSlugs modSlug, itemSlug
         controller = new ItemPageController _.extend {itemSlug:slug}, @_defaultOptions
         @_setPage 'item', controller
 
@@ -84,9 +90,9 @@ module.exports = class CraftingGuideRouter extends Backbone.Router
         text = ''
         if params.recipeName?
             if params.count?
-                text = "#{params.count}.#{params.recipeName}"
+                text = "#{params.count}.#{_.slugify(params.recipeName)}"
             else
-                text = "#{params.recipeName}"
+                text = _.slugify params.recipeName
 
         @navigate Url.crafting(inventoryText:text), trigger:true