Pin versions.

software/wendelin/software.cfg

 [buildout]
+versions = versions
 extends =
   ../../software/ipython_notebook/software.cfg
   ../../component/fluentd/buildout.cfg
@@ -47,3 +48,13 @@ list = ${erp5:location}/bt5 ${erp5:location}/product/ERP5/bootstrap ${wendelin:l
 <= erp5
 repository = https://lab.nexedi.cn/nexedi/wendelin.git
 branch = master
+
+[versions]
+scikit-learn = 0.16.1
+scipy = 0.15.1
+pandas = 0.16.1
+msgpack-python = 0.4.6
+numpy = 1.9.2
+wendelin.core = 0.2.post1
+ipython = 3.1.0
+matplotlib = 1.4.3
\ No newline at end of file