Implemented new timeline functionality client-side.

* Fixed returned information in ts_api:put_timeline/3
* Added UI for new timeline button.
* Added client-side implementation of new timeline creation. There is a problem
  on the server-side, PUT should support creating new items and updating
  existing items.

www/index.yaws

@@ -76,6 +76,8 @@ out(YArg) ->
                     <div class="timeline-id">(&nbsp;{{id}}&nbsp;)</div>
                     <input class="timeline-id-input" type="text" value='{{id}}'/>
                     <ul class="drop-menu-items">
+                        <li class="new-timeline-link"><a href="#">
+                            <img src="/img/round_plus_icon_16.png"/>new</a></li>
                     </ul>
                 </div>
         </script>