[Feature] Serilog w/ NLog support {WIP}

Support for using serilog piping to NLog

Depends on: https://github.com/serilog/serilog/pull/153
The `AssemblyInfo.cs` is generated by the `Castle.Common.targets` file. If you look at the other csproj files you'll see they have the following two import statements at the end of the file:

    <Import Project="$(RootPath)\Settings.proj" />
    <PropertyGroup>
      <ProjectName>Castle.Services.Logging.Log4NetIntegration</ProjectName>
    </PropertyGroup>
    <Import Project="$(BuildScriptsPath)\Castle.Common.targets" />