title: tensorflow attributeerror moddule has no attribute per_image_standardization
body: <p>I'm trying to go through the tutorial on convolutional neural nets using cifar10.  The cnn is being built (cifar10.py) but when I try to run cifar10_train.py I'm getting the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "cifar10_train.py", line 115, in &lt;module&gt;
      tf.app.run()
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/platform/app.py", line 30, in run
      sys.exit(main(sys.argv))
    File "cifar10_train.py", line 111, in main
      train()
    File "cifar10_train.py", line 58, in train
      images, labels = cifar10.distorted_inputs()
    File "/home/brennus/workspace/python/cifar/cifar10.py", line 141, in distorted_inputs
      batch_size=FLAGS.batch_size)
    File "/home/brennus/workspace/python/cifar/cifar10_input.py", line 177, in distorted_inputs
      float_image = tf.image.per_image_standardization(distorted_image)
  AttributeError: 'module' object has no attribute 'per_image_standardization'
  </code></pre>
  
  <p>According to <a href="https://github.com/tensorflow/tensorflow/blob/master/tensorflow/g3doc/api_docs/python/image.md" rel="nofollow noreferrer">https://github.com/tensorflow/tensorflow/blob/master/tensorflow/g3doc/api_docs/python/image.md</a>, there is indeed a per_image_standardization attribute but it looks like my tensorflow doesn't have it.  I'm not sure what version I have and not sure where to find it, but I built it from source from the repository so I imagine it's the current one.</p>
  
  <p>I can't find anyone else who is having this problem so I'm stymied.  Maybe I have to write my own?</p>