Increase resilience of worker by breaking out the "fetch job" vs "do job" parts - #19

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cooperaj wants to merge 6 commits into

maxbrokman:0.2from

UniversityOfNottingham:feature/0.2-make-worker-resiliant

Commits on Oct 18, 2018

Add new exception and move existing into exceptions folder.
cooperaj
committed
29cd433
Move to PHP7.1 minimum version and implement changes to worker.
cooperaj
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218c9de