Add activerecord-session_store dependency

Extracted from Rails core.

Signed-off-by: Alex Coles <alex@alexbcoles.com>

Gemfile

@@ -31,6 +31,7 @@ source 'https://rubygems.org'
 gem "rails", "4.0.13"
 gem 'protected_attributes'
 gem 'actionpack-action_caching'
+gem 'activerecord-session_store'
 gem 'rails-observers'
 
 gem "coderay", "~> 1.0.9"

Gemfile.lock

@@ -49,6 +49,10 @@ GEM
       activesupport (= 4.0.13)
       arel (~> 4.0.0)
     activerecord-deprecated_finders (1.0.4)
+    activerecord-session_store (0.1.1)
+      actionpack (>= 4.0.0, < 5)
+      activerecord (>= 4.0.0, < 5)
+      railties (>= 4.0.0, < 5)
     activerecord-tableless (1.3.4)
       activerecord (>= 2.3.0)
     activesupport (4.0.13)
@@ -439,6 +443,7 @@ DEPENDENCIES
   actionpack-action_caching
   activerecord-jdbcmysql-adapter
   activerecord-jdbcpostgresql-adapter
+  activerecord-session_store
   activerecord-tableless (~> 1.0)
   acts_as_list (~> 0.3.0)
   airbrake (~> 4.1.0)
@@ -532,3 +537,6 @@ DEPENDENCIES
   warden (~> 1.2)
   warden-basic_auth (~> 0.2.0)
   will_paginate (~> 3.0)
+
+BUNDLED WITH
+   1.10.4