Add tracing support to sentry-resque

[st0012]

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[codecov-commenter]

Codecov Report

Merging #1480 (54e4648) into master (493a3a0) will increase coverage by 0.57%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1480      +/-   ##
==========================================
+ Coverage   98.22%   98.79%   +0.57%     
==========================================
  Files         216      122      -94     
  Lines       10357     6560    -3797     
==========================================
- Hits        10173     6481    -3692     
+ Misses        184       79     -105     

Impacted Files	Coverage Δ
sentry-resque/spec/sentry/resque_spec.rb	97.81% <ø> (-0.81%)	⬇️
sentry-resque/lib/sentry/resque.rb	100.00% <100.00%> (ø)
sentry-resque/spec/sentry/tracing_spec.rb	100.00% <100.00%> (ø)
sentry-raven/lib/raven/processor/post_data.rb
...raven/spec/raven/processors/utf8conversion_spec.rb
...c/raven/processors/removecirculareferences_spec.rb
...raven/integrations/rails/controller_transaction.rb
sentry-raven/spec/raven/logger_spec.rb
sentry-raven/lib/raven/linecache.rb
... and 90 more

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