Pluggable fetch strategies#24

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woodhull wants to merge 4 commits intoenova:masterfrom

controlshift:pluggable-fetch-strategies

Commits on May 1, 2017

adds a sleep strategy and ability to configure the strategy.
woodhull
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Commits on May 2, 2017

adds a schedule in future strategy.
woodhull
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Commits on May 3, 2017

spec that each of the strategies can still retrieve work
woodhull
committed
add jitter to the time when retries are scheduled. this is helpful in our particular use case
woodhull
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