Merge pull request #1 from chatcannon/typofix

Typofix
typo in notebook filename
Fix predicted labels for faces plots
typo ?  ('bias' -> 'variance')
Merge pull request #2 from pierre-haessig/patch-1

typo ?  ('bias' -> 'variance')
Merge branch 'master' of github.com:GaelVaroquaux/sklearn_pandas_tutorial into typofix