BF: fix doctest failure with pre-release numpy

Numpy output printing has changed in upcoming 1.14 - trigger legacy
printing for doctests.

Author: matthew-brett

nibabel/nicom/dwiparams.py

@@ -21,7 +21,7 @@
 '''
 import numpy as np
 import numpy.linalg as npl
-from ..testing import setup_test  # flake8: noqa F401
+from ..testing import setup_test as setup_module # flake8: noqa F401
 
 
 def B2q(B, tol=None):

nibabel/testing/__init__.py

@@ -218,4 +218,4 @@ def setup_test():
     """
     from distutils.version import LooseVersion
     if LooseVersion(np.__version__) >= LooseVersion('1.14'):
-        np.set_printoptions(sign='legacy')
+        np.set_printoptions(legacy="1.13")