Adding experimental content types

Adds containable to "Page"
Create a basic "List Item" for testing Containers/Lists

--HG--
branch : dev

src/Orchard.Web/Modules/Orchard.Experimental/Orchard.Experimental.csproj

@@ -80,6 +80,7 @@
     <Compile Include="Controllers\MetadataController.cs" />
     <Compile Include="DebugFilter.cs" />
     <Compile Include="Handlers\DebugLinkHandler.cs" />
+    <Compile Include="Migrations.cs" />
     <Compile Include="Models\ShowDebugLink.cs" />
     <Compile Include="Models\Simple.cs" />
     <Compile Include="Permissions.cs" />