ocr dataset added
import clean up
renamed seconds_per_epoch channel
Merge pull request #348 from bouthilx/master

renamed seconds_per_epoch channel
Merge pull request #347 from memimo/ocr

OCR Dataset
fix bug in get test
Build inplace stuff and download the dataset for the buildbot.
fix test when floatX=float64
pep8
Use older pytables version to allow to test with python 2.6 due to dependency stuff.
Merge pull request #352 from nouiz/fix_tests

Fix tests
FIX: top_down shape, DisconnectedType Gradient

in middle of gradient bug fix
grad bug fixed for image size < 8
grad bug fixed for all cases
float32_floatX added to tests
Merge pull request #349 from memimo/ocr

fix bug in get test
Merge pull request #353 from memimo/pmp_bug

FIXED, Probabilistic Max Pooling Grad Bug
Fix the buildbot script.
implementation of the expr method

Conflicts:
	pylearn2/costs/mlp/dropout.py
additional functionality