title: How to install Python package from GitHub?
body: <p>I want to use a new feature of httpie. This feature is in the github repo <a href="https://github.com/jkbr/httpie" rel="noreferrer">https://github.com/jkbr/httpie</a> but not in the release on the python package index <a href="https://pypi.python.org/pypi/httpie" rel="noreferrer">https://pypi.python.org/pypi/httpie</a> </p>
  
  <p>How can I install the httpie package from the github repo? I tried</p>
  
  <pre><code>pip install https://github.com/jkbr/httpie
  </code></pre>
  
  <p>But I got  an error 'could not unpack'</p>
  
  <hr>
  
  <p>In Nodejs, I can install packages from github like this</p>
  
  <pre><code>npm install git+https://github.com/substack/node-optimist.git
  </code></pre>