Fix compatibility with caching middleware

Fixes #405
Merge branch 'fix-marshalling-for-cache'
Target pengwynn/pingwynn for stats specs

Octokit.rb has a rather large dataset, more than we need for testing so
I pointed the ion cannon at pengwynn/pingwynn to satisfy the Stats
specs.
Fix client secret filter for cassette recording
Merge pull request #410 from joeyw/target-pingwynn-for-stats-specs

Target pengwynn/pingwynn for stats specs
Merge pull request #411 from joeyw/fix-vcr-client-secret-filter

Fix client secret filter for cassette recording