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.

src/ts_api.erl

@@ -321,7 +321,7 @@ put_timeline(YArg, Username, TimelineId) ->
 
         no_record -> make_json_404(YArg,
             [{error, "no such timeline"},
-             {see_docs, "/ts_api_doc/timelines.html#POST"}]);
+             {see_docs, "/ts_api_doc/timelines.html#PUT"}]);
 
         Error -> 
             error_logger:error_report("Unable update timeline: ~p", [Error]),