Run nosetests with verbose flag on Travis

Hopefully stops tests from hanging after completion - seems to work on
Jenkins.

.travis.yml

@@ -24,7 +24,7 @@ install:
     - pip install -f travis-wheels/wheelhouse file://$PWD#egg=notebook[test] coveralls
 script:
     - 'if [[ $GROUP == js* ]]; then python -m notebook.jstest ${GROUP:3}; fi'
-    - 'if [[ $GROUP == python ]]; then nosetests --with-coverage --cover-package=notebook notebook; fi'
+    - 'if [[ $GROUP == python ]]; then nosetests -v --with-coverage --cover-package=notebook notebook; fi'
 matrix:
     include:
         - python: 3.3