title: polymer string concatenation for template repeat in v 1.0
body: <p>I'm not sure if the following is possible with a "computed" and a dom-repeat template. I was binding with child and parent properties prior to .9/.8/1.0</p>
  
  <pre><code>&lt;template is="dom-repeat" as="agreementTypeCount" index-as="agreementTypeCountI" items="{{agreementTypeCounts}}"&gt;
    &lt;a href="/{{style_domain}}/agreements/#/table/country/{{selectedCountryCode}}/type/{{agreementTypeCount.type}}/sort/start-desc/size/10/page/1/"&gt;{{agreementTypeCount.type}}&lt;/a&gt;
  &lt;/template&gt;
  </code></pre>
  
  <p>Are there any plans to implement string concatenation? It would make life <strong>so</strong> much easier!</p>