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/models/recipe.coffee

@@ -15,8 +15,7 @@ module.exports = class Recipe extends BaseModel
     constructor: (attributes={}, options={})->
         if attributes.item?
             attributes.name = attributes.item.name
-            attributes.slug = attributes.item.slug
-            attributes.output ?= [new Stack slug:attributes.item.slug, quantity:1]
+            attributes.output ?= [new Stack slug:attributes.item.qualifiedSlug, quantity:1]
 
         if not attributes.name? then throw new Error 'attributes.name is required'
         if not attributes.input? then throw new Error 'attributes.input is required'
@@ -25,11 +24,13 @@ module.exports = class Recipe extends BaseModel
         attributes.item    ?= null
         attributes.output  ?= [new Stack slug:_.slugify(attributes.name), quantity:1]
         attributes.pattern = @_parsePattern attributes.pattern
-        attributes.slug    ?= attributes.output[0].slug
         attributes.tools   ?= []
         options.logEvents  ?= false
         super attributes, options
 
+        Object.defineProperties this,
+            slug: {get:@getSlug}
+
     # Public Methods ###############################################################################
 
     getItemSlugAt: (patternSlot)->
@@ -48,6 +49,12 @@ module.exports = class Recipe extends BaseModel
             return true if stack.slug is itemSlug
         return false
 
+    # Property Methods #############################################################################
+
+    getSlug: ->
+        return @item.qualifiedSlug if @item?
+        return @output[0].slug
+
     # Object Overrides #############################################################################
 
     toString: ->