added education#classes and fixed "users" assigner

lib/fb_graph2/attribute_assigner.rb

@@ -70,6 +70,10 @@ module FbGraph2
               end
             when :user
               User.new raw[:id], raw
+            when :users
+              Collection.new(raw).collect do |_raw_|
+                User.new _raw_[:id], _raw_
+              end
             else
               # NOTE: handle these attributes in each class
               next

lib/fb_graph2/page.rb

@@ -36,7 +36,7 @@ module FbGraph2
       page: [:best_page],
       photo: [:cover],
       users: [
-        # NOTE: only as Struct::Work#projects
+        # NOTE: only as Struct::Education#classes and Struct::Work#projects
         :with
       ],
       custom: [

lib/fb_graph2/struct/education.rb

@@ -4,7 +4,7 @@ module FbGraph2
       register_attributes(
         raw: [:type],
         page: [:school, :year],
-        pages: [:concentration]
+        pages: [:classes, :concentration]
       )
     end
   end