• file descriptor should not be monitored any more when the tcp connection is destructed.
• valid file descriptors that can be closed are >= 0
• added more parameter-types to set properties in the envelope
• the ReceivedFrame class has been split into a InBuffer base class to make it easier to store messages without having to construct a full frame
• moved the ReceivedFrame class to the src-directory, as it is of no use for userspace applications
• ability to store and retrieve envelopes
• fixed crash because the wrong size was passed