Check y

By using the get_debug_values() function and with flag "theano.config.compute_test_value" turned on, we can now check the value of Y before computing kl or elemwise_kl. Note that this feature should only be expected to work in test time, not for passed values in a real function call.

Should we check every mode of "theano.config.compute_test_value" in the unit test? Or, since it is only a unit test for kl (or elemwise_kl), just testing it on one of the mode will be OK?
Further PEP8 nitpicking, but just for future reference: Inline comments should be separated with 2 spaces from code, and there should be 1 space between `#` and the comment.
```python
# A comment here
print 'something'  # Another comment here
```