ENH importing basic pieces at a top level

Author: mwaskom

nipype/__init__.py

@@ -15,6 +15,10 @@
 
 from .fixes.numpy.testing import nosetester
 
+from pipeline import Node, MapNode, Workflow
+from interfaces import (DataGrabber, DataSink, IdentityInterface, Rename,
+                        Function, Select, Merge)
+
 class _NoseTester(nosetester.NoseTester):
     """ Subclass numpy's NoseTester to add doctests by default
     """

nipype/interfaces/__init__.py

@@ -7,3 +7,5 @@
 """
 __docformat__ = 'restructuredtext'
 
+from io import DataGrabber, DataSink
+from utility import IdentityInterface, Rename, Function, Select, Merge

nipype/pipeline/__init__.py

@@ -5,3 +5,4 @@
 
 """
 __docformat__ = 'restructuredtext'
+from engine import Node, MapNode, Workflow