Merge pull request #284 from effigies/mnt/namespace_package

ENH: Reserve pydra.tasks as a namespace package

Author: satra

docs/api.rst

@@ -13,4 +13,5 @@ Subpackages
 
    api/pydra.engine
    api/pydra.mark
+   api/pydra.tasks
    api/pydra.utils

pydra/tasks/__init__.py

@@ -0,0 +1,11 @@
+""" Pydra tasks
+
+The ``pydra.tasks`` namespace is reserved for collections of Tasks, to be managed and
+packaged separately.
+To create a task package, please fork the `pydra-tasks-template
+<https://github.com/nipype/pydra-tasks-template>`__.
+"""
+try:
+    __import__("pkg_resources").declare_namespace(__name__)
+except ImportError:
+    pass  # must not have setuptools