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
Fix toggle switch positioning
Cache responses even when Cache-Control is private

* Cache requests to limit requests that count against rate limit
* Use Marshal for serialization instead of JSON because of serialization issue

https://github.com/plataformatec/faraday-http-cache/issues/38
Enable DotPosition rule
Set up and use New Relic

https://trello.com/c/WKSxzMlK/234-set-up-new-relic