環境
$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.9.5
BuildVersion: 13F1911
$ ruby -v
ruby 2.2.6p396 (2016-11-15 revision 56800) [x86_64-darwin13]
$ bundle -v
Bundler version 1.13.7
bitbucket-rest-api-ciというGemを作ります
$ bundle gem bitbucket-rest-api-ci