Fix `SiteSetingExtension` specs to coerce int to string.

lib/site_setting_extension.rb

@@ -284,6 +284,8 @@ module SiteSettingExtension
   def add_override!(name, val)
     type = get_data_type(name, defaults[name.to_sym])
 
+    val = val.to_s if type == types[:string]
+
     if type == types[:bool] && val != true && val != false
       val = (val == "t" || val == "true") ? 't' : 'f'
     end

spec/components/site_setting_extension_spec.rb

@@ -179,7 +179,6 @@ describe SiteSettingExtension do
       end
 
       it "should coerce int to string" do
-        skip "This test is not working on Rspec 2 even"
         settings.test_str = 100
         expect(settings.test_str).to eq("100")
       end