title: Can I get bower to install packages when there's a version mismatch?
body: <p>When I upgrade a version in <code>bower.json</code> from say <code>2.8.1</code> to <code>2.8.2</code> and run <code>bower install</code> it doesn't actually install the new version. I can run <code>bower install -f</code> but that re-installs all packges.</p>
  
  <p>Can I make bower install only when necesary?</p>