setup.py: add numpy to setup_requires, nose2 to extras_require[tests]

diff --git a/setup.py b/setup.py
index 01ed2bd..0248a1a 100755 (executable)
--- a/setup.py
+++ b/setup.py
@@ -70,9 +70,13 @@ distrib = setup(name='aubio',
     platforms = 'any',
     classifiers = classifiers,
     install_requires = ['numpy'],
+    setup_requires = ['numpy'],
     cmdclass = {
         'clean': CleanGenerated,
         'build_ext': build_ext,
         },
     test_suite = 'nose2.collector.collector',
+    extras_require = {
+        'tests': ['numpy'],
+        },
     )