title: using a package locally with hex.pm
body: <p>Is it possible to use a local mix project as a hex dependency?</p>
  
  <p>With Bundler I could add a line like:</p>
  
  <pre><code>gem 'action_subscriber', :path =&gt; "../action_subscriber"
  </code></pre>
  
  <p>so that I could try out using the gem before I published a new version.  Is this possible with the hex dependency management tool?</p>