Gpu specify shape

Sparse

place. Also add the infer_shape method to Remove0

Minor stuff

Also fixed an indent issue

Crash fix

fix theano import crash on computer without gpu when theano flags device or init_gpu_device start with gpu.

Removes host_from_gpu and gpu_from_host around specify_shapes node,
making it run transperently on the GPU

Link blas to epd library correcly on windows.

Sparse

Remove use of sys.maxint in slices.

Sparse

vars with broadcastable dims were being disallowed unfairly from being update exprs