title: install python package from github using requirements.txt
body: <p>Whats the successful way to import packages from github repo? </p>
  
  <p>Here is what I tried
  Tried Installing a python package- corepkg,  which is available in git repository - git.example.com/corepkg.git </p>
  
  <p>In another Project- Proj2, to import logic from above corepkg package, Kept an entry in requirements.txt and ran the following pip command.  </p>
  
  <p>pip install -r requirements.txt</p>
  
  <p>Here are my Entries in requirement.txt for Proj2</p>
  
  <pre><code>...
  PyYAML==3.12
  requests==2.18.4
  urllib3==1.22
  git+https://git.example.com/corepkg.git@develop
  </code></pre>
  
  <p>But it did not create any src folder or .dist-info folder in virtual environment site-packages? 
  It just created corepkg-1-py3.6.egg_info file but not files required to import.</p>
  
  <p>Whats the step I am missing here to import it successfully from git? </p>