New user_stats table to keep track of queried information on a user.

This is information that is not usually needed when representing a user
and is in a separate table with a has one relationship to avoid querying
it all the time.

spec/models/user_stat_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+describe UserStat do
+
+  it { should belong_to :user }
+
+  it "is created automatically when a user is created" do
+    user = Fabricate(:evil_trout)
+    user.user_stat.should be_present
+  end
+
+end