.travis.yml: Run the sharness tests

Signed-off-by: W. Trevor King <wking@tremily.us>

Author: wking

.travis.yml

@@ -15,4 +15,4 @@ script:
   - $HOME/gopath/bin/golint ./...
   - $HOME/gopath/bin/git-validation -run DCO,short-subject -v -range ${TRAVIS_COMMIT_RANGE}
   - make
-  
+  - PATH="${PATH}:${PWD}" make -C test