Fix condition in equal_computations

Fix how some tests get a reference to scan nodes in a theano function

[CRASH new backend] Fix comparison between ssize_t and size_t

Mixed: more error detection, clean up, optimization

Fix syntax error.

[CRASH] add check to ensure that first input is HostFromGpu in gpuarray/local_assert

Fix some different behavior depending with not default mode.

Register local_remove_all_assert

[REGRESSION, CRASH]Fix crash gpu

[CRASH with Scan in new backend]

[WIP] New optimization: useless incsubtensor alloc

theano/tensor/nnet/nnet.py: Wrote docstring for Softmax

Remove dependance on io_toposort in equal_computations()

A bunch of pep8 work

Add an optimization that remove Split with only 1 split. (Close #2545)

Tests