made ZCA more stable
Merge branch 'master' of github.com:lisa-lab/pylearn2
Merge pull request #443 from goodfeli/master

Make ZCA more numerically stable
Update self.data_specs when calling convert_to_one_hot
Merge pull request #444 from lamblin/update_data_specs

Update self.data_specs when calling convert_to_one_hot
newer cifar-10 results, at least on validation set
Merge pull request #445 from goodfeli/master

newer cifar-10 results, at least on validation set