adding chocolatey nupkg. This bundles all Scriptcs assemblies in a scriptcs nupkg. The ChocolateyInstall will copy them to `$env:appdata\scriptcs, use nuget.exe to install nuget.core and roselyn assemblies and will then add $env:appdata\scriptcs to the path.
Migrating to use Autofac for internal dependencies and MEF 4.0 for external
adding powerargs to nugets that chocolatey needs to manually pull from nuget feed
Added mssing namespace imports from script packs to RoslynScriptEngine
renaming bootstrapper/composition root
Added distinct to references and namespaces
ScriptCs.exe returns an exit code, so ERRORLEVEL env. variable can be used to determine result