Rupert sidekiq#1

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RupertSaxton wants to merge 6 commits intopaircolumbus:masterfrom

RupertSaxton:RupertSidekiq

Commits on Jan 22, 2018

Add pry to Gemfile and complete task 1
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Complete Exercise 2
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Complete exercise 3
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Complete Exercise 4
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Complete Exercise 5
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Update exercise 5 with better error handling
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