Sklearn changed their internal format yet again

We need to have a version compatible with our Flect models (and eventually, get rid of sklearn completely)

doc/installing_qtleap_server-pilot2.txt

@@ -84,7 +84,7 @@ cpanm App::Ack # just for me now, ack is much better than grep
 # either
 # sudo apt-get install python-sklearn
 # but I prefer pip over apt-get
-pip install --user numpy scipy scikit-learn
+pip install --user numpy scipy scikit-learn==0.15.1
 # OD's side note: the apt-get version will install faster (no need to compile)
 
 # Treex svn checkout (read-only access)