Tweak travis.yml so coleslaw-test is found.

.travis.yml

     - $HOME/.config/common-lisp
 
 script:
-  - ros -s prove -e '(or (prove:run :coleslaw-test) (uiop:quit -1))'
+  - ros -s prove -e "(ql:quickload '(coleslaw coleslaw-test))"
+                 -e '(or (prove:run :coleslaw-test) (uiop:quit -1))'

coleslaw.asd

                 :components
                         ((:test-file "tests"))))
   :perform (test-op :after (op c)
-                    (funcall (intern #.(string :run) :prove) c)))
+                    (uiop:symbol-call :prove 'run c)))
 
 (defpackage #:coleslaw-conf (:export #:*basedir*))
 (defparameter coleslaw-conf:*basedir*