[MRG] FIX/DOC make link clickable (#254)
[MRG] FIX/DOC make link clickable (#254)

* FIX/DOC make link clickable

* PEP8/FIX

scikit-learn-contrib/imbalanced-learn,glemaitre/UnbalancedDataset,fmfn/UnbalancedDataset,scikit-learn-contrib/imbalanced-learn,glemaitre/UnbalancedDataset,fmfn/UnbalancedDataset