Refactored the build and package functionality for MvcSiteMapProvider and MvcSiteMapProvider into reusable functions.
Put readme file in a shared location in the configuration Nuget packages. Added the web.config.transform file back in. Factored out Nuspec file creation into another function.
Removed unnecessary DI config files from the nuget directory.
Moved Nuspec transform code for MvcSiteMapProvider into nuget\MvcSiteMapProvider directory. Removed duplicate MvcSiteMapSchema.xsd from nuget\MvcSiteMapProvider.Web.
Made prerelease switch in Init.ps1 for MvcSiteMapProvider packages conditional depending on whether the build is prerelease.