Merged devel to master (file system serving)

File system serving support fully merged to master. 
Directory indexing still isn't done but a fully hybrid non-blocking file server is up and running.

Core runs in non-blocking mode and communities to a FileSystemRequestHandler, running in it's own thread, via a Pipe (non blocking requests / responses just like a socket channel).

On the file server size, the single file server thread reads requests and files and writes responses fully in non-blocking mode as well.

Net result is a file throughput performance that can easily saturate a SATA 3.0 SSD and a gigabit network connection.