Merge pull request #253 from goodfeli/master

make sgd support fixed_var_descr
Added input_space and output_space to DeepComposedAutoencoder

Added input_space and output_space attributes to
DeepComposedAutoencoder.  This is required to use
DeepComposedAutoencoder as a model.
Merge pull request #254 from dansbecker/master

Added input_space and output_space attributes to DeepComposedAutoencoder
Merge pull request #256 from goodfeli/master

Support for learning multiple targets from an infinite random data stream
Merge pull request #259 from goodfeli/master

pickle file converter
added __init__.py
Merge pull request #260 from willkurt/master

Added missing __init__.py to blackbox challenge
doc for PretrainedLayer
fixed wrong accuracy number in README
added some input validation to black_box_dataset