fix cost_from_X_data_specs
test_mlp.py: check that 'misclass' in mlp's with index targets, by comparing to the 'same' mlp with vector targets
fix comment
fix definition of the 'misclass' channel in Softmax where _has_binary_target
enhance test_mlp.py to check both misclass and nll with binary_target_dim
fix a travis failure in test_mlp.py:test_softmax_bin_targts_channels:
- set the dtype of the batch data to floatX.
Merge branch 'fix_mlp_softmax_misclass' of https://github.com/micklat/pylearn2 into fix_mlp_softmax_misclass