Auto-focus the tag name field in the add tag dialog

static/partials/view-repo.html

@@ -350,7 +350,7 @@
         <div class="modal-body">
           <input type="text" class="form-control" id="tagName" placeholder="Enter tag name"
                  ng-model="tagToCreate" ng-pattern="/^([a-z0-9_\.-]){3,30}$/" required
-                 ng-disabled="creatingTag">
+                 ng-disabled="creatingTag" autofocus>
           <div style="margin: 10px; margin-top: 20px;" ng-show="isOwnedTag(toTagImage, tagToCreate)">
             Note: <span class="label tag label-default">{{ tagToCreate }}</span> is already applied to this image.
           </div>