Add GoogleAnalytics event tracking

src/client/site/common/inventory/inventory_controller.coffee

@@ -40,6 +40,7 @@ module.exports = class InventoryController extends BaseController
         @_isAcceptable       = options.isAcceptable       ?= null
         @_secondButtonType   = options.secondButtonType   ?= null
         @_shouldEnableButton = options.shouldEnableButton ?= (model, button)-> true
+        @_trackingContext    = options.trackingContext    ?= null
 
         options.templateName  = 'common/inventory'
         super options
@@ -54,20 +55,26 @@ module.exports = class InventoryController extends BaseController
         return unless @model?
         return if @$clearButton.hasClass 'disabled'
 
+        tracker.trackEvent @_trackingContext, 'clear'
         @model.clear()
         @trigger c.event.clear, this
         @trigger c.event.change, this
 
     onFirstButtonClicked: (stackController)->
+        tracker.trackEvent @_trackingContext, 'remove-from', stackController?.model?.itemSlug
         @trigger c.event.button.first, this, stackController?.model?.itemSlug
 
     onItemSelectorButtonClicked: ->
         return unless @model?
 
+        tracker.trackEvent @_trackingContext, 'launch-add-to'
         @_selector.launch()
             .then (itemSlug)=>
-                return unless itemSlug?
+                if not itemSlug?
+                    tracker.trackEvent @_trackingContext, 'cancel-add-to'
+                    return
 
+                tracker.trackEvent @_trackingContext, 'complete-add-to', itemSlug
                 @model.add itemSlug, 1
                 @trigger c.event.add, this, itemSlug
                 @trigger c.event.change, this
@@ -136,6 +143,7 @@ module.exports = class InventoryController extends BaseController
                         router:             @_router
                         secondButtonType:   @_secondButtonType
                         shouldEnableButton: @_shouldEnableButton
+                        trackingContext:    @_trackingContext
                     controller.on c.event.change, => @trigger c.event.change, this
                     controller.on c.event.button.first, (c)=> @onFirstButtonClicked(c)
                     controller.on c.event.button.second, (c)=> @onSecondButtonClicked(c)

src/client/site/common/item_selector/item_selector_controller.coffee

@@ -29,10 +29,6 @@ module.exports = class ItemSelectorController extends BaseController
     # Public Methods ###############################################################################
 
     launch: (hint='')->
-        if @_session
-            @_session.resolve null
-            @_session = null
-
         @model.hint = hint
         if @rendered then @refresh()
 
@@ -141,6 +137,10 @@ module.exports = class ItemSelectorController extends BaseController
         @$popup.detach()
         @model.hint = ''
 
+        if @_session
+            @_session.resolve null
+            @_session = null
+
     _disableWindowScrolling: ->
         @_windowScrollPosition = $(window).scrollTop()
         $('body').addClass('scrollDisabled').css('margin-top', -@_windowScrollPosition)

src/client/site/common/markdown_section/markdown_section_controller.coffee

@@ -60,6 +60,7 @@ module.exports = class MarkdownSectionController extends BaseController
     # Event Methods ################################################################################
 
     onCancelClicked: (event)->
+        tracker.trackEvent c.tracking.category.markdown, 'cancel'
         @model = @_originalModel
         @resetToDefaultState()
 
@@ -70,6 +71,7 @@ module.exports = class MarkdownSectionController extends BaseController
     onEditClicked: (event)->
         return false unless @editable
 
+        tracker.trackEvent c.tracking.category.markdown, 'edit'
         @_originalModel = @model
         @state = @State.waiting
         @_beginEditing()
@@ -87,15 +89,18 @@ module.exports = class MarkdownSectionController extends BaseController
         return false
 
     onPreviewClicked: (event)->
+        tracker.trackEvent c.tracking.category.markdown, 'preview'
         @_updatePreview()
         @state = @State.previewing
         return false
 
     onReturnClicked: (event)->
+        tracker.trackEvent c.tracking.category.markdown, 'return'
         @state = @State.editing
         return false
 
     onSaveClicked: (event)->
+        tracker.trackEvent c.tracking.category.markdown, 'save'
         @state = @State.waiting
         @_endEditing()
             .then =>

src/client/site/common/stack/stack_controller.coffee

@@ -36,6 +36,7 @@ module.exports = class StackController extends BaseController
         @_modPack            = options.modPack
         @_secondButtonType   = options.secondButtonType   ?= null
         @_shouldEnableButton = options.shouldEnableButton ?= (model, button)-> true
+        @_trackingContext    = options.trackingContext    ?= null
 
         @_modPack.on c.event.change, => @tryRefresh()
 
@@ -70,6 +71,8 @@ module.exports = class StackController extends BaseController
             @trigger c.event.change + ':quantity', this, oldQuantity, newQuantity
             @trigger c.event.change, this
 
+            tracker.trackEvent @_trackingContext, 'update-quantity', @model.itemSlug, @model.quantity
+
     onQuantityFieldChanged: ->
         return unless @_editable