Remove the restriction on indexing a broadcastable dimension for GpuAdvancedIncSubtensor1 and test that case.
Fix the broadcastable flags in case of broadcastable input.
Same fix for broadcastable to the GPU versions.
Add tests for gradient in broadcastable cases

Also check shape of returned arrays in addition to value
Merge pull request #16 from lamblin/abergeron-fix_gpuadvsub1

Add tests for gradient in broadcastable cases
Remove the old sparse_grad interface.
Fix the checks on the GPU versions of the ops (again).
Merge pull request #2029 from abergeron/fix_gpuadvsub1

Remove the restriction on indexing a broadcastable dimension.