Overriding configuration with environment variables in typesafe config : <p>Using <a href="https://github.com/typesafehub/config" rel="noreferrer">typesafe config</a>, how do I override the reference configuration with an environment variable? For example, lets say I have the following configuration:</p>

<pre><code>foo: "bar"
</code></pre>

<p>I want it to be overriden with the environment variable <code>FOO</code> if one exists.</p>
