Refactor sentry-ruby.rb and add comments

[st0012]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1529 (72b4b49) into master (a1f1dbc) will increase coverage by 0.55%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1529      +/-   ##
==========================================
+ Coverage   98.21%   98.76%   +0.55%     
==========================================
  Files         218      123      -95     
  Lines       10626     6787    -3839     
==========================================
- Hits        10436     6703    -3733     
+ Misses        190       84     -106     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry-ruby.rb	100.00% <100.00%> (ø)
sentry-raven/lib/raven/interface.rb
sentry-raven/lib/raven/breadcrumbs.rb
sentry-raven/lib/raven/transports/dummy.rb
...lib/raven/integrations/rails/controller_methods.rb
.../lib/raven/integrations/rails/backtrace_cleaner.rb
...integrations/rails/overrides/streaming_reporter.rb
...y-raven/lib/raven/integrations/rails/active_job.rb
...b/raven/integrations/sidekiq/cleanup_middleware.rb
sentry-raven/lib/raven/backtrace.rb
... and 86 more

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