Merge pull request #159 from goodfeli/master

Move autoencoder into models directory
Doc format + setup method for TrainExtension.
Helpful error when trying to execute wrong train.py
Merge branch 'master' of git://github.com/lisa-lab/pylearn2
Goofed the 'sys' import.
Use self.extensions, guaranteed to be list
Merge pull request #160 from goodfeli/master

Make it possible to monitor costs besides the training cost
Fast k-means code.
Patch old ViewConverter pickles.
Merge pull request #161 from goodfeli/master

Better error messages, etc.
added seed to MLP