Fix any methods
Fix any methods

- add missing Event#any
- allow mix of futures and events, completed event has value nil and is always
  successful
- any does not propagate touch if already complete

lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,hobodave/concurrent-ruby,hobodave/concurrent-ruby