Merge pull request RolifyCommunity#206 from GoodGuide/master

Add select(:id) to active record 'in' query to avoid MySQL errors in Rails 4.0.2

lib/rolify/adapters/active_record/resource_adapter.rb

@@ -12,7 +12,7 @@ def resources_find(roles_table, relation, role_name)
       end
 
       def in(relation, user, role_names)
-        roles = user.roles.where(:name => role_names)
+        roles = user.roles.where(:name => role_names).select(:id)
         relation.where("#{quote(role_class.table_name)}.#{role_class.primary_key} IN (?) AND ((resource_id = #{quote(relation.table_name)}.#{relation.primary_key}) OR (resource_id IS NULL))", roles)
       end