Part 1. Compare the revisions, showing which parts of slides were authored by which users. Related to SWIK-696 - Getting issue details... STATUS , SWIK-1082 - Getting issue details... STATUS
Part 2. Counting the user contribution to slides and decks. Related to SWIK-696 - Getting issue details... STATUS
Part 3. Count the user reputation based on its contribution to liked slides and decks
Part 4. Introduce a concept of Patron (deck was authored in slidewiki by darya, but Darya is a PhD student of Soeren - he also has to get points for the deck, because...because this is life=)