Implemented edit and update for entries.

- Added ts_entry:delete/1 to delete an entry from the database.
- Implemented ts_api:delete_entry/3.
- Added a form to facilitate editing individual entries.
- Moved the small show/hide functions directly into the HTML.
- Wired up the update timeline form.
- Wired up the edit and update entry form.

src/ts_api.erl

@@ -482,7 +482,22 @@ post_entry(YArg, Username, TimelineId, EntryId) ->
         _Error -> make_json_500(YArg)
     end.
 
-delete_entry(_YArg, _Username, _TimelineId, _EntryId) -> todo.
+delete_entry(YArg, Username, TimelineId, EntryId) -> 
+
+    % find the record to delete
+    case ts_entry:lookup(Username, TimelineId, EntryId) of
+
+        Record ->
+            % try to delete
+            case ts_entry:delete(Record) of
+                ok -> {status, 200};
+                Error ->
+                    io:format("Error occurred deleting entry record: ~p", [Error]),
+                    make_json_500(YArg)
+            end;
+
+        no_record -> make_json_404(YArg)
+    end.
 
 % ============================== %
 % ======== UTIL METHODS ======== %