do not retry Octokit::Unauthorized
Add missing expectation
Use cached GitHub responses when 304 is returned

https://trello.com/c/1qeitvaD/204-address-rate-limiting
Add default style guide test coverage
Update octokit to 3.0.0

https://trello.com/c/CHslAnNh/165-upgrade-octokit
Improve layout for mobile devices

https://trello.com/c/2KpPDwLa/207-clean-up-layout-on-mobile-devices
Bump rubocop to 0.20.1

https://trello.com/c/ECCr8yci/199-upgrade-rubocop

* Replace DefWithoutParentheses with MethodDefParentheses
* Replace ReduceArguments with SingleLineBlockParams
* Replace SpaceAroundBlockBraces with SpaceBeforeBlockBraces and SpaceInsideBlockBraces
* Remove SymbolName
* Replace config for DefWithParentheses with MethodDefParentheses
* Update DotPosition configuration to new style
* Remove SingleLineBlockParams
* Update RuboCop configuration