Cast ws, strides and pads to 64 bits integers into both Python and C code
for all these ops.

Make sure that ws, strides and pads for GpuPool, GpuMaxPoolGrad and GpuAveragePoolGrad are `npy_intp` arrays.

Use 64-bit indices in sparse.AddSD where necessary (fix #5525)

Scan fix

Prepare release 0.9.0rc1.

Fix reST nested lists syntax.
Fix typos.

Update .mailmap, then update count and list of contributors

[CRASH] Fix crash of GpuElemwise that have too many inputs

If there is no room for even 2 inputs, then it will fail rather than
loop endlessly.

Clarify error message related to expected kern_shape specs (1D, int64) in GpuDnnConvDesc

Clarify error message related to expected kern_shape in GpuDnnConvDesc make_node() method, and fix a related test in test_dnn.

Fix invalid pointer casts and negative stride handling in sparse

Fix crash due to excessive decref of 1

Fix compilation crash show by THEANO_FLAGS='floatX=float32,dnn.conv.a…

Fix `-Wl,rpath` parameter for Windows (fix #5463).

Do not decref borrowed references.

Fix batchnorm problems