title: "pip install line_profiler" fails
body: <p>I type</p>
  
  <pre><code>sudo pip install "line_profiler"
  </code></pre>
  
  <p>and I get</p>
  
  <pre><code>Downloading/unpacking line-profiler
    Could not find a version that satisfies the requirement line-profiler (from versions: 1.0b1, 1.0b2, 1.0b3)
  Cleaning up...
  No distributions matching the version for line-profiler
  Storing debug log for failure in /home/milia/.pip/pip.log
  </code></pre>
  
  <p>When I search for line_profile using</p>
  
  <pre><code>sudo pip search "line_profiler"
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>django-debug-toolbar-line-profiler - A panel for django-debug-toolbar that integrates
                          information from line_profiler
  line_profiler             - Line-by-line profiler.
  tracerbullet              - A line-by-line profiler that doesn't suck.
  </code></pre>
  
  <p>Somehow the underscore gets turned to "-". How can I bypass that?</p>