Fixes #222, index page links are broken in sub-application.
Fixes #234, updating resets mvc.sitemap file. Also added strict dependency versioning so updating the main DI package will always cause the MvcSiteMapProvider.MVCx and MvcSiteMapProvider.MVCx.Core packages to stay in sync, while leaving the MvcSiteMapProvider.MVCx.DI.[Container].Modules and MvcSiteMapProvider.Web packages alone.
Fixes #233 web.config formatting changes when upgrading.