scikit-learn: add scipy in setup-eggs.

component/scikit-learn/buildout.cfg

@@ -13,4 +13,6 @@ parts =
 recipe = zc.recipe.egg:custom
 egg = scikit-learn
 environment = scikit-learn-env
-setup-eggs = ${numpy:egg}
+setup-eggs =
+  ${numpy:egg}
+  ${scipy:egg}