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/mod_pack.coffee

@@ -25,9 +25,16 @@ module.exports = class ModPack extends BaseModel
     findItem: (slug, options={})->
         options.includeDisabled ?= false
 
+        [modSlug, itemSlug] = _.decomposeSlug slug
+        if modSlug?
+            mod = @getMod modSlug
+            if mod?
+                item = mod.findItem itemSlug, options
+                return item if item?
+
         for mod in @_mods
             continue unless mod.enabled or options.includeDisabled
-            item = mod.findItem slug, options
+            item = mod.findItem itemSlug, options
             return item if item?
 
         return null
@@ -36,10 +43,9 @@ module.exports = class ModPack extends BaseModel
         options.enableAsNeeded ?= false
         options.includeDisabled = true if options.enableAsNeeded
 
-        slug = _.slugify name
         for mod in @_mods
             continue unless mod.enabled or options.includeDisabled
-            item = mod.findItem slug, options
+            item = mod.findItemByName name, options
             return item if item?
 
         return null
@@ -74,6 +80,14 @@ module.exports = class ModPack extends BaseModel
         return null
 
     findRecipes: (slug, result=[])->
+        [modSlug, itemSlug] = _.decomposeSlug slug
+
+        if modSlug?
+            mod = @getMod modSlug
+            if mod?
+                mod.findRecipes slug, result
+                return result if result.length > 0
+
         for mod in @_mods
             continue unless mod.enabled
             mod.findRecipes slug, result
@@ -88,12 +102,9 @@ module.exports = class ModPack extends BaseModel
 
     isValidName: (name)->
         slug = _.slugify name
-        for mod in @_mods
-            continue unless mod.enabled
-            name = mod.findName slug
-            return true if name
+        existingName = @findName slug
 
-        return false
+        return name is existingName
 
     # Property Methods #############################################################################
 
@@ -101,6 +112,7 @@ module.exports = class ModPack extends BaseModel
         if not mod? then throw new Error 'mod is required'
         return if @_mods.indexOf(mod) isnt -1
 
+        mod.modPack = this
         @_mods.push mod
         @listenTo mod, Event.change, => @trigger Event.change, this
         @trigger Event.add + ':mod', mod, this