Remove summary ops from tf namespace.
Remove summary ops from tf namespace.

tf.histogram_summary, tf.scalar_summary, tf.audio_summary, tf.image_summary, tf.merge_all_summaries, tf.merge_summary are all removed.
Nearly-identical and fully supported apis are available at
tf.summary.histogram, tf.summary.scalar, tf.summary.audio, tf.summary.image, tf.summary.merge_all, tf.summary.merge

The major change in the new API is that the summary "tag" is now actually the node name, which means the TF naming system will automatically deduplicate summary tags.

If you need an exact match for the old API, you may use tf.contrib.deprecated.histogram_summary, etc, but these endpoints will eventually be removed.
Change: 140792244

agrubb/tensorboard,francoisluus/tensorboard-supervise,ioeric/tensorboard,ioeric/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,shakedel/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,agrubb/tensorboard,qiuminxu/tensorboard,shakedel/tensorboard,shakedel/tensorboard,ioeric/tensorboard,francoisluus/tensorboard-supervise,agrubb/tensorboard,agrubb/tensorboard,ioeric/tensorboard,qiuminxu/tensorboard,shakedel/tensorboard,ioeric/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,shakedel/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,francoisluus/tensorboard-supervise,shakedel/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,ioeric/tensorboard