Update travis config for shifted directory structure.

.travis.yml

@@ -35,7 +35,7 @@ before_script:
   - set +H
 
 script:
-  - sh -c "if [ '$PHPCS' != '1' ]; then cd ./lib && phpunit --stderr; else phpcs -p --extensions=php --standard=CakePHP ./lib/Cake; fi"
+  - sh -c "if [ '$PHPCS' != '1' ]; then phpunit --stderr; else phpcs -p --extensions=php --standard=CakePHP ./Cake; fi"
 
 notifications:
   email: false