Added test for CudaTensor.expand
Added test for CudaTensor.expand

The test fails

soumith/cutorch,LinusU/cutorch,Zhen-hao/cutorch,clementfarabet/cutorch,wickedfoo/cutorch,adamlerer/cutorch,torch/cutorch,fmassa/cutorch,adamlerer/cutorch,luketwitter/cutorch,hughperkins/cutorch,wickedfoo/cutorch,yvan-sraka/cutorch,0wu/cutorch,Zhen-hao/cutorch,clementfarabet/cutorch,LinusU/cutorch,torch/cutorch,luketwitter/cutorch,Moodstocks/cutorch,Schakirov/cutorch_my,torch/cutorch,0wu/cutorch,hughperkins/cutorch,Schakirov/cutorch_my,Moodstocks/cutorch,yvan-sraka/cutorch