Add Common Lisp reference

Signed-off-by: Zlatozar Zhelyazkov <zlatozar@gmail.com>
Add note how to reload lisp-koans

Signed-off-by: Zlatozar Zhelyazkov <zlatozar@gmail.com>
Reorganize packages because of many versions of the same program

- start chapter 4

Signed-off-by: Zlatozar Zhelyazkov <zlatozar@gmail.com>

join

Signed-off-by: Zlatozar Zhelyazkov <zlatozar@gmail.com>