- RuleEngine implementation for widget layer rules.

- The ResultFilter uses the rule manager to filter out layers and widgets.
- Added rules to default layers.
- RuleManager with callback injection into the dlr scripting sandbox.
- RuleProvider implementations for Url and Authenticated. Anonymous is just "not Authenticated".
- RuleContext.
- Renaming Layer.Rule to Layer.LayerRule. NHibernate bug for SqlCe most likely, couldn't escape "Rule" as expected.
- Unit tests.

--HG--
branch : dev

src/Orchard.Web/Modules/Orchard.Widgets/Orchard.Widgets.csproj

@@ -69,6 +69,9 @@
     <Compile Include="Permissions.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Filters\WidgetFilter.cs" />
+    <Compile Include="RuleEngine\AuthenticatedRuleProvider.cs" />
+    <Compile Include="RuleEngine\RuleManager.cs" />
+    <Compile Include="RuleEngine\UrlRuleProvider.cs" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="Module.txt" />