adding pytest to ravis

Author: djarecka

.travis.yml

@@ -132,6 +132,7 @@ script:
           cd for_testing
           cp ../.coveragerc .
           nosetests --with-doctest --with-coverage --cover-package nibabel nibabel
+          pytest -v nibabel/tests/test_affines.py
       else
           false
       fi

setup.cfg

@@ -33,6 +33,7 @@ install_requires =
     numpy >=1.12
 tests_require =
     nose >=0.11
+    pytest
     mock
 test_suite = nose.collector
 zip_safe = False
@@ -54,6 +55,7 @@ test =
     coverage
     mock
     nose >=0.11
+    pytest
 all =
     %(dicom)s
     %(doc)s