Events count fix

[gaffel85]

shoudlPromptForRating did stop checking events count when uses count did reach its goal.
By changing AND to OR both expression will be checked.

[nicklockwood]

This isn't actually a bug, but a design decision. Arguably it was a bad decision, but applying this fix as it stands actually breaks the default functionality, since usesUntilPrompt defaults to 10, so any app that doesn't log any events will never present the notification.

If you want to prevent notifications unless both use count AND event count have been reached, you can add this additional check using the iRate delegate.

[nicklockwood]

I'll leave this open for now - I may consider changing this behaviour at some point but it will need some other changes to be made as well.