Hopefully fixed untracked changes check command in .travis.yml.

Author: mchalapuk

.travis.yml

@@ -11,6 +11,6 @@ install:
 script:
   - python -m unittest discover tests
   - gulp
-  - 'test -z "`git status -s | tee /dev/stderr`" || echo "Encountered untracked changes after generating e2e test. Did you forget run gulp?" && false'
+  - 'test -z "`git status -s | tee /dev/stderr`" || (echo "Encountered untracked changes after generating e2e test. Did you forget run gulp?" && false)'
   - ./e2e_test.sh