Introduce #fb_connected_distribution to make statistics_spec.rb pass under PostgreSQL.

Statistics can still be gathered the same way when MySQL is being used; no alteration there.

lib/statistics.rb

@@ -83,6 +83,16 @@ SQL
 SQL
   end
 
+  def fb_connected_distribution
+    User.connection.select_all(fb_connected_distribution_sql).map { |row|
+      Hash[
+        row.map { |k,v|
+          [k, v.to_i]
+        }
+      ]
+    }
+  end
+
   def sign_in_count_sql
     <<SQL
       SELECT users.id AS id, users.sign_in_count AS count

spec/lib/statistics_spec.rb

@@ -99,7 +99,7 @@ describe Statistics do
                  {"id" => local_luke.id , "count" => 0, "connected" => 0 },
                  {"id" => local_leia.id , "count" => 0, "connected" => 0 }]
 
-      User.connection.select_all(@stats.fb_connected_distribution_sql).should =~ @result
+      @stats.fb_connected_distribution.should =~ @result
     end
   end