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Added `#exists?` methods to a handful of resource classes.

The `#exists?` method works by polling the exists wait for the resource
exactly once. If the waiter is successful, then `true` is returned, if it
fails, then `false` is returned.

To add additional `#exists?` methods, a waiter must be added to the resource
class as `Exists` and that waiter must be defined in the *.waiters.json
document for that service.

See #696

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