title: can't install scipy - freezes on "Running setup.py install for scipy"
body: <p>when I run</p>
  
  <pre><code>sudo pip install -U scipy
  </code></pre>
  
  <p>it is first downloaded and then it goes on to show</p>
  
  <pre><code>Running setup.py install for scipy
  </code></pre>
  
  <p>but it freezes there. I tried upgrading pip itself. Worked fine. My pip version is 1.5.4</p>
  
  <p>The only error i get is InsecurePlatforWarning. The complete output looks like this:</p>
  
  <pre><code>tom@tom-ThinkPad-Edge-E430:~$ sudo pip install -U scipy
  The directory '/home/tom/.cache/pip/http' or its parent directory
  is not owned by the current user and the cache has been disabled.
  Please check the permissions and owner of that directory. If
  executing pip with sudo, you may want sudo's -H flag.
  The directory '/home/tom/.cache/pip' or its parent directory is not
  owned by the current user and caching wheels has been disabled.
  check the permissions and owner of that directory. If executing pip with
  sudo, you may want sudo's -H flag.
  Collecting scipy
  /usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90:
  InsecurePlatformWarning: A true SSLContext object is not available.
  This prevents urllib3 from configuring SSL appropriately and
  may cause certain SSL connections to fail. For more information, see
  https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading scipy-0.16.1.tar.gz (12.2MB)
     100% |████████████████████████████████| 12.2MB 32kB/s 
  Installing collected packages: scipy
     Running setup.py install for scipy
  </code></pre>