test requirements now listed in extras_require for pip

setup.py

@@ -35,6 +35,10 @@ test_requirements = [
     # TODO: put package test requirements here
 ]
 
+extras_requirements = {
+    'tests': test_requirements
+    }
+
 setup(
     name='ordr2',
 
@@ -75,6 +79,8 @@ setup(
     test_suite='tests',
     tests_require=test_requirements,
 
+    extras_require = extras_requirements,
+
     setup_requires=setup_requirements,
     entry_points={
         'paste.app_factory': [