[Feature] Serilog w/ NLog support {WIP}

Support for using serilog piping to NLog

Depends on: https://github.com/serilog/serilog/pull/153
Castle Project doesn't currently use any NuGet references in its projects, we've got a lib directory with the binaries committed. Could you please add the DLLs into the lib directory and remove the packages.config files. Thanks.