Add sentry-delayed_job integration

[st0012]

Closes #1129

[codecov-io]

Codecov Report

Merging #1273 (98a45af) into master (85b3e30) will increase coverage by 0.53%.
The diff coverage is 88.57%.

@@            Coverage Diff             @@
##           master    #1273      +/-   ##
==========================================
+ Coverage   97.99%   98.52%   +0.53%     
==========================================
  Files         200      108      -92     
  Lines        8668     4874    -3794     
==========================================
- Hits         8494     4802    -3692     
+ Misses        174       72     -102     

Impacted Files	Coverage Δ
sentry-delayed_job/lib/sentry-delayed_job.rb	71.42% <71.42%> (ø)
...entry-delayed_job/lib/sentry/delayed_job/plugin.rb	100.00% <100.00%> (ø)
...try-raven/lib/sentry-raven-without-integrations.rb
...ntry-raven/spec/raven/processors/post_data_spec.rb
...try-raven/lib/raven/interfaces/single_exception.rb
...lib/raven/integrations/rails/controller_methods.rb
sentry-raven/lib/raven/processor/cookies.rb
sentry-raven/lib/raven/context.rb
sentry-raven/spec/raven/client_spec.rb
sentry-raven/lib/raven/breadcrumbs.rb
... and 90 more

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