title: SSLError using pip install (to install tensorflow)
body: <p>while installing TF, exception appeared: </p>
  
  <blockquote>
    <p>File
    "/usr/local/lib/python2.7/dist-packages/pip/_vendor/cachecontrol/adapter.py",
    line 46, in send
    resp = super(CacheControlAdapter, self).send(request, **kw)   File "/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/adapters.py",
    line 447, in send
    raise SSLError(e, request=request) SSLError: ("bad handshake: Error([('SSL routines', 'SSL3_GET_SERVER_CERTIFICATE', 'certificate
    verify failed')],)",)</p>
  </blockquote>
  
  <pre><code>command: pip install --upgrade https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.6.0-cp27-none-linux_x86_64.whl
  </code></pre>
  
  <p>I have no clue how to solve this. I was recently reinstalled pip, could reinstall cause it? </p>