title: Mac could not find a version that satisfies the requirement scikit-image?
body: <p>I tried <code>pip install scikit-image</code>, 
  however, the output:</p>
  
  <blockquote>
    <p>/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/pip/<em>vendor/requests/packages/urllib3/util/ssl</em>.py:315:
    SNIMissingWarning: An HTTPS request has been made, but the SNI
    (Subject Name Indication) extension to TLS is not available on this
    platform. This may cause the server to present an incorrect TLS
    certificate, which can cause validation failures. For more
    information, see
    <a href="https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning" rel="nofollow">https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning</a>.
    SNIMissingWarning   Could not fetch URL
    <a href="https://pypi.python.org/simple/scikit-image/" rel="nofollow">https://pypi.python.org/simple/scikit-image/</a>: There was a problem
    confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED]
    certificate verify failed (_ssl.c:598) - skipping  Could not find a
    version that satisfies the requirement scikit-image (from versions: )
    No matching distribution found for scikit-image</p>
  </blockquote>
  
  <p>Any ideas? Thank you so much!</p>
  
  <p>And then I was trying to solve the problem based on the information on the website It seems like I have problems to enable SSL on Google AppEngine.I don't know how could I do it and is it necessary in order to install certifi? </p>