re-hookup refresh model

Author: Ben Rubin

docsApp/pages/home/home.html

@@ -1,5 +1,5 @@
 <div layout="row">
-  <md-tree ng-model="vm.selectedItems" restrict-selection="depth,single" flex>
+  <md-tree ng-model="vm.selectedItems" restrict-selection="depth" flex>
     <md-branch branch-repeat="location in vm.locationData" class="md-2-line" select>
       <div class="md-branch-text">
         <h3>{{location.name}}</h3>

src/js/tree.js

@@ -108,6 +108,8 @@ function treeDirective($mdTheming, $mdUtil) {
       } else {
         deselect(hashKey);
       }
+      // TODO update model without calling select on branches
+      refreshViewValue();
     }
 
     function deselectAll() {