title: npm install github repo strips src folder
body: <p>I did the following:</p>
  
  <pre><code>npm install TuningGuide/react-sortable-hoc --save
  npm info it worked if it ends with ok
  npm info using npm@3.10.5
  npm info using node@v6.2.2
  npm info git [ 'clone',
  npm info git   '--template=/Users/velten/.npm/_git-remotes/_templates',
  npm info git   '--mirror',
  npm info git   'git://github.com/tuningguide/react-sortable-hoc.git',
  npm info git   '/Users/velten/.npm/_git-remotes/git-github-com-tuningguide-react-sortable-hoc-git-78a804e9' ]
  npm info git [ 'rev-list', '-n1', 'master' ]
  npm info git [ 'clone',
  npm info git   '/Users/velten/.npm/_git-remotes/git-github-com-tuningguide-react-sortable-hoc-git-78a804e9',
  npm info git   '/var/folders/95/ylk5ht9s24n6xk4rcr6sch4r0000gn/T/npm-22395-24e6f9cc/git-cache-220f34bb/09fb1e0c7d657657b9aa091c018b45aee0ed0662' ]
  npm info git [ 'checkout', '09fb1e0c7d657657b9aa091c018b45aee0ed0662' ]
  npm info git [ 'submodule', '-q', 'update', '--init', '--recursive' ]
  npm info attempt registry request try #1 at 14:18:51
  npm http request GET https://registry.npmjs.org/invariant
  npm http 304 https://registry.npmjs.org/invariant
  npm info lifecycle invariant@2.2.1~preinstall: invariant@2.2.1
  npm info lifecycle react-sortable-hoc@0.0.7~preinstall: react-sortable-hoc@0.0.7
  npm info linkStuff invariant@2.2.1
  npm info linkStuff react-sortable-hoc@0.0.7
  npm info lifecycle invariant@2.2.1~install: invariant@2.2.1
  npm info lifecycle react-sortable-hoc@0.0.7~install: react-sortable-hoc@0.0.7
  npm info lifecycle invariant@2.2.1~postinstall: invariant@2.2.1
  npm info lifecycle react-sortable-hoc@0.0.7~postinstall: react-sortable-hoc@0.0.7
  typescript-react-mobx-boilerplate@1.0.0 /Users/velten/Websites/typescript-react-mobx-boilerplate
  └─┬ react-sortable-hoc@0.0.7  (git://github.com/tuningguide/react-sortable-hoc.git#09fb1e0c7d657657b9aa091c018b45aee0ed0662)
    └── invariant@2.2.1 
  
  npm info ok 
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/tZqoQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tZqoQ.png" alt="folder"></a> </p>
  
  <p>But the folder does not contain the source nor the build. Why?</p>