implemented last-forum-read-at

Gemfile.lock

@@ -48,8 +48,6 @@ GEM
       multi_json (~> 1.0)
     arel (2.1.4)
     bcrypt-ruby (2.1.4)
-    bourbon (0.1.5)
-      sass (>= 3.1)
     builder (3.0.0)
     daemons (1.1.4)
     delayed_job (2.1.4)
@@ -105,7 +103,6 @@ GEM
       thor (~> 0.14.6)
     rake (0.9.2)
     rdoc (3.9.1)
-    sass (3.1.7)
     shoulda (2.11.3)
     silent-postgres (0.0.8)
     simple_form (1.4.2)
@@ -137,7 +134,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bourbon
   delayed_job
   factory_girl
   ffaker!