ENH: Add support for cross generalization for time_gen

@dengemann @agramfort

This is work in progress, I will let you know when to review it.

Thanks!
Yes 

> On 6 oct. 2014, at 19:22, J-R King <notifications@github.com> wrote:
> 
> In mne/decoding/time_gen.py:
> 
> >  
> > +from sklearn.cross_validation import StratifiedKFold
> > +from sklearn.base import clone
> > +from sklearn.metrics import roc_auc_score, accuracy_score
> > +from sklearn.preprocessing import StandardScaler
> > +from sklearn.svm import SVC
> > +from sklearn.pipeline import Pipeline
> "Nested import": meaning that I should put the import within each relevant subfunction?
> 
> —
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