Update to latest version of kaminari (0.1.3)

Updating to fix deprecation warning following Rails 3.2 upgrade:

  DEPRECATION WARNING: The InstanceMethods module inside
  ActiveSupport::Concern will be no longer included automatically. Please
  define instance methods directly in Kaminari::PageScopeMethods instead.
  (called from include at app/models/stratify/activity.rb:3)

Unfortunately, Kaminari 1.1.3 has an open bug related to Mongoid:

  https://github.com/amatsuda/kaminari/issues/145

For now, we will work around this bug (which rears its head in
ActivitiesController#index) by wrapping the Mongoid query results in a
call to Kaminari.paginate_array.

stratify-rails/Gemfile.lock

@@ -101,16 +101,18 @@ GEM
       thor (~> 0.14)
     json (1.7.0)
     json_pure (1.5.1)
-    kaminari (0.12.4)
-      rails (>= 3.0.0)
+    kaminari (0.13.0)
+      actionpack (>= 3.0.0)
+      activesupport (>= 3.0.0)
+      railties (>= 3.0.0)
     launchy (0.4.0)
       configuration (>= 0.0.5)
       rake (>= 0.8.1)
     mail (2.4.4)
       i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    mime-types (1.17.2)
+    mime-types (1.18)
     mocha (0.9.12)
     mongo (1.6.2)
       bson (~> 1.6.2)

stratify-rails/app/controllers/activities_controller.rb

@@ -2,7 +2,10 @@ class ActivitiesController < ApplicationController
   before_filter :prompt_user_to_setup_collectors_if_no_activities_exist, :only => :index
 
   def index
-    @activities = Stratify::Activity.desc(:created_at).page params[:page]
+    # TODO Simplify the logic below once this bug is fixed in Kaminari:
+    #      https://github.com/amatsuda/kaminari/issues/145
+    activity_criteria = Stratify::Activity.desc(:created_at)
+    @activities = Kaminari.paginate_array(activity_criteria).page(params[:page])
   end
 
   def destroy