Updating swank.scm to work with current slime-cvs

Updating swank.scm to work with current slime-cvs

* Startup Problems [when using Emacs setting (slime-setup '(slime-fancy))]
- M-x slime raises condition "Unbound variable: swank:swank-require"
  => fixed by defining swank:swank-require to return '()
- M-x slime shows "error in process filter: Can't find suitable coding-system"
  => fixed by adding :encoding (:coding-systems ("utf-8-unix" "iso-latin-1-unix")) to the connection info
- M-x slime raises condition "Unbound variable :conding-system" (which is due to all parameters being evaluated)
  => fixed by adding QUOTE-SPECIAL and mapping it over the parameters (quoting all keywords [symbols that start with a colon] and T and NIL)
- Typing an expression raises condition "Unbound variable: swank:autodoc"
  => fixed by defining swank:autodoc to return (list ':not-available 't)
- Slime complains about mismatched versions
  => fixed by changing :version in swank:connection-info to "2012-05-02" which matches slime-cvs

Now we have a working SLIME REPL again.