v4.6.4

Change Log

1. Enhancement: Closes #308, performance improvements in SiteMapHierarchyBuilder that make loading the SiteMap into the cache faster, especially notable on SiteMaps with large numbers of nodes (thanks @cpswizard).
2. Bug: Fixes #318, filtered null types from the assemblies returned from the MvcSiteMapNodeAttributeDefinitionProvider.GetTypesFromAssembly() method.
3. Bug: Fixes #316, security trimming not functioning with AttributeRouting and MVC 5.1.x.
4. Enhancement: Changed default Menu template to include the CSS classes for the default MVC5/bootstrap project template.
5. Bug: Fixes #310, equality check causing node mismatches when the cache is rebuilt, causing failures when using multiple HTML helpers.