typos + pep stuf
Reverted some change
Merge pull request #308 from samuelstjean/typo_csd

typos + pep stuf
WIP: Started implementing cross-validation from model predictions.
ENH: A bit more work on cross-validation.
BF: The order of the output needs to be like the order of the data...

Also: some more flexibility on the model API that is accepted.
PEP8

Before I start mucking about here.