Added /count-newer/:time method to rest servlet, #19
Moved EntryService to a seaparate package
EntryServlet now returns entries with timestamp, #19

EntryService returns entries and one new element, timestamp describing when entries were loaded. This timestamp will be used by client to check if there are any new entries since given timestamp value.
Entries are now loaded on demand, closes #19

- Application checks if there are new entries every 5 seconds
- If there are new entries, message is shown with option to refresh entries list.