Penelope should reload the sources from WebAPI on application startup

penelope caches the sources to local storage the first time it reads them from WebAPI.  It then always reuses the sources from the local storage, even if the WebAPI sources have been updated.

See: Penelope/web/js/main.js

// Get the sources from localStorage - if not found, retrieve them from the WS

```
if (pageModel.sources().length == 0)
```
