Fix several small bugs

* Fix AddThis component not showing up by altering the URL they
  provide to use GET parameters instead of the hash component
* Fix a bug with saving the "have" items on the crafting page

src/coffee/controllers/craft_page_controller.coffee

@@ -43,7 +43,7 @@ module.exports = class CraftPageController extends PageController
     onMoveNeedToHave: (itemSlug)->
         quantity = @model.plan.need.quantityOf itemSlug
         @model.plan.have.add itemSlug, quantity
-        @_saveHaveInventory()
+        @onHaveInventoryChanged()
 
     onRemoveFromHaveInventory: (itemSlug)->
         @model.plan.have.remove itemSlug

src/coffee/controllers/header_controller.coffee

@@ -78,8 +78,8 @@ module.exports = class HeaderController extends BaseController
             $navLink.css 'z-index', zIndex--
 
         if global.env in ProductionEnvs
-            addThisUrl = '//s7.addthis.com/js/300/addthis_widget.js#pubid=ra-54f3c9717b2e530d'
-            $('body').append "<script async src=\"#{addThisUrl}\"></script>"
+            addThisUrl = 'http://s7.addthis.com/js/300/addthis_widget.js?pubid=ra-54f3c9717b2e530d'
+            $('body').append "<script async=\"async\" src=\"#{addThisUrl}\"></script>"
 
         @_itemSelector = @addChild ItemSelectorController, '.view__item_selector.search',
             modPack:     @modPack