Implement method abs() for LongTensor and IntTensor
New test for the abs() method for Int and Long tensors
Add tests for the abs() method for doubles and floats
Merge branch 'master' of github.com:torch/torch7
prevent read/write access from/to an empty tensor to segfault with negative indices
Merge branch 'master' of github.com:torch/torch7
added COPYRIGHT
Remove test that has hard coded line number in the message.
TH: fix speed issue due to calls to THTensor_nElement()
TH: optimization for normall
TH: optimization for cadd