Review fixes #6.

Author: SudoBobo

.travis.yml

@@ -31,6 +31,9 @@ script:
     if [ -n "${OS}" ]; then
         git clone https://github.com/packpack/packpack.git
         packpack/packpack
+        pwd
+        ls
+        ls build
     else
         ./tools/ubuntu.trusty.test.sh
     fi;