Purge example from API

Signed-off-by: Chris Sanders <zidane@outlook.com>
Make entities Interactable
Make blocks interactable
The basis of the scheduling API
Merge branch 'master' of https://github.com/SpongePowered/SpongeAPI into HEAD
Remove public modifier
Added get scheduler method to Game interface
Heavily improved the scheduler API
Added getName() to Task
Fixed missing JD
Added a method to get players by name
Prefer Optional<T> over @Nullable