Added a task decorator for QWorkerd plugins#4

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ownaginatious wants to merge 6 commits intoclearclaw:masterfrom

ownaginatious:master

Commits on May 18, 2016

Added a task decorator for QWorkerd plugins
Dillon Dixon
committed
Changed default behaviour to retry on all exceptions
Dillon Dixon
committed
Added missing self argument
Dillon Dixon
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Commits on May 19, 2016

Fixed for result backend implementations
Dillon Dixon
committed

Commits on May 20, 2016

Updated for mergeability
Dillon Dixon
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Commits on May 21, 2016

Updated for correct failure/retry handling
Dillon Dixon
committed