title: Pip exception error
body: <p>I am trying to reinstall pip due to an error that happens when I try to install new libraries or even when I try to uninstall pip itself.<br>
  I reach that part where it asks for confirmation and then gives me the error.   The error it throws is the following (this one is the one it throws when doing "pip uninstall pip"):</p>
  
  <p>Exception:</p>
  
  <pre><code>Traceback (most recent call last):
  
   File "/usr/local/lib/python2.7/dist-packages/pip/basecommand.py", line 211, in main
    status =  self.run(options,args)
  
   File "/usr/local/lib/python2.7/dist-packages/pip/commands/uninstall.py", line 76, in run
  
    requirement_set.uninstall(auto_confirm=options.yes)
  
   File "/usr/local/lib/python2.7/dist-packages/pip/req/req_set.py", line 305, in uninstall
    req.uninstall(auto_confirm=auto_confirm)
  
   File "/usr/local/lib/python2.7/dist-packages/pip/req/req_install.py", line 716, in uninstall
    paths_to_remove.remove(auto_confirm)
  
   File "usr/local/lib/python2.7/dist-packages/pip/req/req_uninstall.py", line 125, in remove
    renames(path, new_path)
  
   File "usr/local/lib/python2.7/dist-packages/pip/utils.__init__.py", line 315, in renames
    shutil.move(old, new)
  
   File "/usr/lib/python2.7/shutil.py", line 303, in move
    os.unlink(src)
  
  OSError: [Errno 13] Permission denied: '/usr/local/bin/pip'`
  </code></pre>