Refactor ModVersion into Mod and ModVersion

* Remove V1 of the mod version parser and shift V2 up to be V1
* Add a parser for mod.cg files, and refactor the the mod-version.cg
  files to push the appropriate content up to the mod.cg
* Remove the concept of "silent" from BaseModel along with logging
  each event as they are fired (which is what really prompted the
  need for it in the first place)
* Move use of the Storage class to be completely the province of the
  controllers most closely related to models affected
* Convert the ModVersionController to the ModController and have it
  take on responsibility for choosing the mod version
* Update BaseModel to support simple accessors for the current state
* Update CraftingPlan to be able to remove uncraftable items
* Implement the Mod model

src/scripts/models/item_page.coffee

@@ -22,7 +22,7 @@ module.exports = class ItemPage extends BaseModel
         attributes.table   ?= new CraftingTable plan:attributes.plan
         super attributes, options
 
-        @modPack.on Event.add, (modVersion)=> modVersion.once 'sync', => @_consumeParams()
+        @modPack.on Event.add + ':mod', (mod)=> mod.on 'sync', => @_consumeParams()
         @plan.on Event.change, => @_updateLocation()
 
     # Private Methods ##############################################################################
@@ -44,4 +44,4 @@ module.exports = class ItemPage extends BaseModel
             slug = if _.isArray(list[0]) then list[0][1] else list[0]
             router.navigate "/item/#{slug}"
         else
-            router.navigate "/"
+            router.navigate "/"