Factor out the anchor prefix to easily allow switching to #!

client/web/minimap-library.html

 <link rel="import" href="minimap-element.html">
 
 <polymer-element name="dartdoc-minimap-library">
   <template>
     <div class="well well-sm nav affix-right" id="minimap">
-      <a href="#{{item.linkHref}}">{{item.decoratedName}}</a>
+      <a href="{{item.prefixedLinkHref}}">{{item.decoratedName}}</a>
       <ul>
         <dartdoc-minimap category="{{item.operators}}" item="{{item}}">
         </dartdoc-minimap>
         <dartdoc-minimap category="{{item.variables}}" item="{{item}}">
         </dartdoc-minimap>
         <dartdoc-minimap category="{{item.functions}}" item="{{item}}">
         </dartdoc-minimap>
         <dartdoc-minimap category="{{item.classes}}" item="{{item}}">
         </dartdoc-minimap>
         <dartdoc-minimap category="{{item.typedefs}}" item="{{item}}">
         </dartdoc-minimap>
         <dartdoc-minimap category="{{item.errors}}" item="{{item}}">
         </dartdoc-minimap>
       </ul>
     </div>
   </template>
   <script type="application/dart" src="minimap-library.dart"></script>
 </polymer-element>