Minor changes for compatibility with LispWorks.

Signed-off-by: Camille Troillard <camille@osculator.net>
Merge pull request #19 from tuscland/master

Minor fixes for LispWorks (and other non-sbcl common lisps) compatability
dealing with unused variable warnings

lisp-unit.lsp had a few unused variable warnings that have been declared
as (ignore). Also koans/lists.lsp had an unused variable some-events
because of no asserts on that variable.
Merge pull request #20 from filipk/master

Dealing with "unused lexical variable" warnings
Update README.md
Update README.md
update todo to add item about error reporting
Modifying failure message to cause less stress.
readme matches softer error message