update reader

The reader now properly reads stuff.  It can also read to the end of
line.
intro to response processing

Using the functions defined in ``reader.lisp'' (`read' and `read-line'),
get lisp structure from the IMAP stream and create a response object for
later signalling.
sample connection

For testing of the reader to make sure stuff works.  Needs to be opened
as '(UNSIGNED-BYTE 8) and wrapped in a flexi-stream.