title: Use public maven repository with ivy
body: <p>I have an <code>ivy.xml</code> containing</p>
  
  <pre><code>&lt;dependencies&gt;
    &lt;dependency org="commons-lang" name="commons-lang" rev="2.4"/&gt;
    &lt;dependency org="foo-bar" name="superwidgets" rev="1.5"/&gt;
  &lt;/dependencies&gt;
  </code></pre>
  
  <p>The whole superwidget stuff is hosted in a maven repository at <a href="http://example.com/m2/" rel="noreferrer">http://example.com/m2/</a>.  The ivy documentation <a href="http://ant.apache.org/ivy/history/latest-milestone/resolver/url.html" rel="noreferrer">mentions resolvers</a>, but it seems to assume an ivy repository.  How can I add a single unofficial maven repository to my ivy settings to be used only by a single module?  (Or put another way, what corresponds to maven's <code>&lt;repository&gt;</code> tag in ivy?) Nothing fancy, so I'd expect a one-liner in my ivy.xml.</p>