title: Error in python after 'import tensorflow': TypeError: __init__() got an unexpected keyword argument 'syntax'
body: <p>I installed TensorFlow on my Ubuntu 15.10 machine as instructed for CPU only:</p>
  
  <pre class="lang-sh prettyprint-override"><code>$ pip install https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.5.0-cp27-none-linux_x86_64.whl
  </code></pre>
  
  <p>Then when I run the Python REPL and import tensorflow, I get:</p>
  
  <pre class="lang-sh prettyprint-override"><code>$ python
  Python 2.7.10 (default, Oct 14 2015, 16:09:02) 
  [GCC 5.2.1 20151010] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import tensorflow as tf
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/home/phil/.local/lib/python2.7/site-packages/tensorflow/__init__.py", line 4, in &lt;module&gt;
     from tensorflow.python import *
    File "/home/phil/.local/lib/python2.7/site-packages/tensorflow/python/__init__.py", line 13, in &lt;module&gt;
      from tensorflow.core.framework.graph_pb2 import *
    File "/home/phil/.local/lib/python2.7/site-packages/tensorflow/core/framework/graph_pb2.py", line 16, in &lt;module&gt;
      from tensorflow.core.framework import attr_value_pb2 as     tensorflow_dot_core_dot_framework_dot_attr__value__pb2
    File "/home/phil/.local/lib/python2.7/site-packages/tensorflow/core/framework/attr_value_pb2.py", line 16, in &lt;module&gt;
      from tensorflow.core.framework import tensor_pb2 as tensorflow_dot_core_dot_framework_dot_tensor__pb2
    File "/home/phil/.local/lib/python2.7/site-packages/tensorflow/core/framework/tensor_pb2.py", line 16, in &lt;module&gt;
      from tensorflow.core.framework import tensor_shape_pb2 as tensorflow_dot_core_dot_framework_dot_tensor__shape__pb2
    File "/home/phil/.local/lib/python2.7/site-packages/tensorflow/core/framework/tensor_shape_pb2.py", line 22, in &lt;module&gt;
      serialized_pb=_b('\n,tensorflow/core/framework/tensor_shape.proto \x12\ntensorflow\"d\n\x10TensorShapeProto\x12-\n\x03\x64im\x18\x02 \x03(\x0b\x32 .tensorflow.TensorShapeProto.Dim\x1a!\n\x03\x44im\x12\x0c\n\x04size\x18\x01 \x01(\x03\x12\x0c\n\x04name\x18\x02 \x01(\tb\x06proto3')
  TypeError: __init__() got an unexpected keyword argument 'syntax'
  </code></pre>
  
  <p>I have the Ubuntu protobuf-compiler package installed and it's version 2.6.1-1.2</p>