Reuse test_comparison in gpuarray to test sgn() isnan on GPU. Make gpuarray better handle nan. At the same time, enable c code for EQ with complex.

Cpu Contiguous Dim Check

Remove the restriction on zero target dimensions when reshaping a CudaNdarray

Props gof tests

Props sandbox

Props sandbox gpuarray

Props sparse sandbox

[WIP, BUG, CRASH] Fix GpuAdvancedIncSubtensor1_dev20 with negative index

Props tensor nnet

[BUG] Fix invalid optimization for product of multiplication

Fix broadcastable pattern of flatten output

__props__ to basic.py

Props tests