Existential operator (was: ||= is much needed?)

[Jeremy Ashkenas]

As requested, running those rough greps again on the top ten most popular
CoffeeScript repos on Github yields:

188 uses of object?.property

32 uses of object?[key]

50 uses of function?(args)

46 uses of variable ?= value

... and the other ones are a bit tricker to grep for. There are at least a
handful more uses of the `function?(args)` style but with implicit
parentheses: `function? arg1, arg2` ...
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