Fix typo.
Closes #10: report Travis regressions to slime-devel
Include cl-lib-0.3.el for Emacs 23 compatibility.

Load cl-lib-0.3.el from contrib/ if 'cl-lib is otherwise not
present.

* contrib/cl-lib-0.3.el: New file.
* slime.el: Require it if (require 'cl-lib) fails.
Missed in last commit.