Add a "Random Item" link to the breadcrumb bar

fixes #216

src/client/models/game/mod.coffee

@@ -93,6 +93,12 @@ module.exports = class Mod extends BaseModel
 
     # Item Methods #################################################################################
 
+    chooseRandomItem: ->
+        effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
+        return null unless effectiveModVersion?
+
+        return effectiveModVersion.chooseRandomItem()
+
     eachItem: (callback)->
         effectiveModVersion = @_activeModVersion or @getModVersion Mod.Version.Latest
         effectiveModVersion.eachItem callback

src/client/models/game/mod_pack.coffee

@@ -25,6 +25,12 @@ module.exports = class ModPack extends BaseModel
 
     # Item Methods #################################################################################
 
+    chooseRandomItem: ->
+        return null unless @_mods.length > 0
+
+        modIndex = Math.floor Math.random() * @_mods.length
+        return @_mods[modIndex].chooseRandomItem()
+
     findItem: (itemSlug, options={})->
         options.includeDisabled ?= false
 

src/client/models/game/mod_version.coffee

@@ -59,6 +59,10 @@ module.exports = class ModVersion extends BaseModel
         return null if result.length is 0
         return result
 
+    chooseRandomItem: ->
+        itemIndex = Math.floor Math.random() * @_slugs.length
+        return @_slugs[itemIndex]
+
     eachItem: (callback)->
         for slug in @_slugs
             item = @findItem slug