Merge pull request #625 from rickardnorlander/master

Updated convnet tutorial: fixed deprecation warnings, and corrected paths
document channels published by train
Merge pull request #654 from bartvm/index_space_dtype

Index space dtypes
Merge pull request #655 from goodfeli/doc_train_channels

document channels published by train
IndexSpace.__eq__ and __str__ no longer ignore the space's dtype
Merge branch 'master' into updated_format_as
SimplyTypedSpace._clean_dtype_arg()'s dtype arg can now be a numpy.dtype object.
Fixed crash that happened when unpickling Spaces that were pickled back when Spaces didn't have dtypes. Now, such old Spaces are given the default dtype (theano.config.floatX)
allow SimplyTypedSpace._clean_dtype_arg() to take a numpy.dtype as its dtype argument
pep8
Added doc to SimplyTypedSpace, clarifying that it's an abstract class
Merge pull request #657 from SuperElectric/updated_format_as

Space unpickling bugfix (backwards-compatibility)
Changed the error type when Conv2D given wrong arguments
Added format enforcement unit test.
Removed line not meant to be commited.
Updated the whitelist to included files which do not respect the format in the latest repository version.
Mostly PEP8 in conv2d
Removed redundant "+\" at the end of some lines.
Reformated code. Also fixed format enforcement from requiring lines to be below 80 to below 79.
Added new line at the end of test_format.py