checks
implemented get_weights
added the iris dataset
cleaned up iris dataset
shuffle and split preprocessor
Merge pull request #228 from goodfeli/master

Iris dataset, shuffle and split preprocessor
Add a simple utility function for GCN.

This should be called by both the preprocessor and any other uses of
GCN.
Moved GCN to expr.
Fix old test and add min_divisor test.
Improve global_contrast_normalize.
Update the preprocessor class.
Fix CIFAR10 class GCN.
Merge pull request #229 from dwf/preprocessing_utility

GCN updates.
first few modifications
more changes
add get_data_specs
fixing description
fix bug
helper functions plus tests
use the get_* functions instead of attributes of the class