We don't handle common TELNET codes

[Adam Kauffman]

The following codes should be handled instead of treated like printable characters.

From RFC854:

     BELL (BEL)              7      Produces an audible or
                                    visible signal (which does
                                    NOT move the print head).
     Back Space (BS)         8      Moves the print head one
                                    character position towards
                                    the left margin.
     Horizontal Tab (HT)     9      Moves the printer to the
                                    next horizontal tab stop.
                                    It remains unspecified how
                                    either party determines or
                                    establishes where such tab
                                    stops are located.
     Vertical Tab (VT)       11     Moves the printer to the
                                    next vertical tab stop.  It
                                    remains unspecified how
                                    either party determines or
                                    establishes where such tab
                                    stops are located.
     Form Feed (FF)          12     Moves the printer to the top
                                    of the next page, keeping
                                    the same horizontal position.

http://www.rfc-editor.org/rfc/rfc854.txt

I have a solution that I will propose in an upcoming Pull Request.

[9swampy]

Merged in the release 0.9.1 I've just pushed to Nuget.

Any problems, shout.