Update layers.py
Update layers.py

The init_ops.one_initializer() function is rewritten on tensorflow 0.12. Maybe 'tf.one_initializer' should be replaced by 'tf.one_initializer()' in tensorlayer for tensorflow 0.12. But i did not check it for tensorflow 0.11 backend.
zsdonghao/tensorlayer,zsdonghao/tensorlayer