fixes #2108, upgrade to postgresql 9.3, fix tests

Gemfile

@@ -19,11 +19,11 @@ group :assets do
 end
 
 gem "rails"
-gem "pg", "0.12.2"
+gem "pg"
 gem "kgio"
 gem "dalli"
 gem "delayed_job"
-gem "delayed_job_active_record", :git => "https://github.com/r888888888/delayed_job_active_record.git", :branch => "postgresql8"
+gem "delayed_job_active_record"
 gem "simple_form"
 gem "mechanize"
 gem "nokogiri"

Gemfile.lock

@@ -1,12 +1,3 @@
-GIT
-  remote: https://github.com/r888888888/delayed_job_active_record.git
-  revision: ed036c188ebc323929a7509a9cebf40466bc0b0d
-  branch: postgresql8
-  specs:
-    delayed_job_active_record (4.0.0)
-      activerecord (>= 3.0, < 4.1)
-      delayed_job (>= 3.0, < 4.1)
-
 GIT
   remote: https://github.com/r888888888/ruby-imagespec.git
   revision: 2dab9811f4abb4fbaeea66feb42e388ba545b2d8
@@ -69,6 +60,9 @@ GEM
     dalli (2.6.4)
     delayed_job (4.0.0)
       activesupport (>= 3.0, < 4.1)
+    delayed_job_active_record (4.0.0)
+      activerecord (>= 3.0, < 4.1)
+      delayed_job (>= 3.0, < 4.1)
     diff-lcs (1.2.4)
     domain_name (0.5.12)
       unf (>= 0.0.5, < 1.0.0)
@@ -226,7 +220,7 @@ DEPENDENCIES
   daemons
   dalli
   delayed_job
-  delayed_job_active_record!
+  delayed_job_active_record
   diff-lcs
   factory_girl
   ffaker
@@ -237,7 +231,7 @@ DEPENDENCIES
   net-ssh
   newrelic_rpm
   nokogiri
-  pg (= 0.12.2)
+  pg
   pry
   rails
   rmagick

app/models/forum_topic.rb

@@ -106,7 +106,7 @@ class ForumTopic < ActiveRecord::Base
   end
 
   def read_by?(user, read_forum_topic_ids)
-    return true if updated_at < user.last_forum_read_at
+    return true if user.last_forum_read_at && updated_at < user.last_forum_read_at
     if read_forum_topic_ids.any? {|topic_id, timestamp| id.to_s == topic_id && updated_at.to_i > timestamp.to_i}
       return false
     end