remove misplaced millis suffix
Arbitrary PhasedBackoffWait fallback strategy

* Instead of specialized locking and sleeping
blocking strategies, allow using any WaitStrategy
as a fallback blocking strategy.

* Make SleepingWaitStrategy configurable to allow
for sleeping immediately without any retries, as
wanted by PhasedBackoffWaitStrategy.
Merge pull request #72 from danielnorberg/arbitrary-phased-backoff-wait-fallback

Arbitrary phased backoff wait fallback + typo fix