Closes #151: Add CCL to Travis CI

* slime-tests.el (compile-defun): Test split into two parts.
(compile-defun-with-reader-characters): Split from `compile-defun'
as CCL does not pass this part.
* .travis.yml: added targets to include CCL 1.9 for Travis builds
* contrib/test/slime-autodoc-tests.el: Mark several tests as failing for
CCL 1.9
Adjust previous change

* .travis.yml (env): Don't overtest on Emacs 23, as per comment.
(install): No need for trailing semicolon.

* slime-tests.el (compile-defun-with-reader-conditionals): Renamed
from `compile-defun-with-reader-characters'. Break long lines.