multiple writes support to SslStream. Fixes #30
exposed remote cert validation callback
using System.Net.Security;
added extra log info to sending messages
added support for basic tcp requests. fixes #42

Actual implementation for serving flash policy file is left to
application. Solution is generic.
Merge branch 'flash'
Merge branch 'log'
fixed async read operations at queued stream
Merge branch 'secure'
fixes EndWrite calls by Task.FromAsync
Merge branch 'secure'