Add VectorSequenceSpace and IndexSequenceSpace
Add *SequenceSpace tests
added newline method with test
typo
added test_newline docstring
fixed docstring formatting
Remove MNIST reference in IndexSequenceSpace
Fix bug in VectorSequenceSpace
Remove None from accepted values for *SequenceSpace.make_theano_batch
replaced prints by logging in utils
replaced prints by logging in files in root dir
replaced print stderror by logger debug
Merge pull request #737 from Menerve/logger_utils_blankline

Logging a new empty line
replaced prints by logging in models
replaced info by debug
Merge pull request #758 from Menerve/logging_utils_root

Print replaced by logging in utils folder and the last files
Merge pull request #754 from Menerve/logging_models

Print replaced by logging in models folder
Merge pull request #717 from vdumoulin/sequence_space

Sequence space
replaced prints by logging in sandbox
replaced prints by logging in train_extensions