fix repo-new ui, fix top-nav search-bar ui

templates/release/new.tmpl

@@ -28,6 +28,7 @@
                             {{end}}
                         </ul>
                     </div>
+                    <input id="tag-target" type="hidden" name="tag_target" value="{{.Repository.DefaultBranch}}"/>
                 </div>
                 <p class="help-block">Choose an existing tag, or create a new tag on publish</p>
             </div>