Added Y check. And uncompleted unit test
added Y value check with get_debug_values, note that it only works in test time now.
modified according to comments of Pascal and Bart.
just added a blank in test_elemwise_kl()
Adjusted the try block.
adjusted the try code block
Adjusted the error info
Adjusted the error info.
Adjusted the error info (3rd time)
Merge pull request #1166 from hantek/check_y

Check Y values for KL divergence