title: Where should an ember add-on place built assets
body: <p>I have an ember-addon, <a href="https://www.npmjs.com/package/ember-cli-grunticon" rel="nofollow">ember-cli-grunticon</a>, that turns svg’s into data uri classes, fallback pngs, etc. using <a href="https://github.com/filamentgroup/grunticon-lib" rel="nofollow">grunticon-lib</a>.  The problem I’m finding is that doing this in a <code>preBuild</code> hook triggers another build if I push the results to <code>public/grunticon</code> (infinite builds - yeah!).  What’s the “right” way to serve these assets?</p>