fix: add missing nibabel

Author: satra

.travis.yml

@@ -6,7 +6,7 @@ before_install:
     - sudo apt-get update -qq
     - sudo apt-get install -qq python-scipy python-nose
     - sudo apt-get install -qq python-networkx python-traits python-setuptools
-    - sudo easy_install nose
+    - sudo easy_install nibabel
     - virtualenv --system-site-packages ~/virtualenv/this
     - source ~/virtualenv/this/bin/activate
 install: python setup.py build_ext --inplace