Bitbucket Build Status Support

[nickels]

Hello, would it be possible to include support for https://confluence.atlassian.com/bitbucket/buildstatus-resource-779295267.html

"This resource manages build statuses on a commit. When someone makes a commit on a Bitbucket Cloud repository, the vendor or build system runs the build and displays the build status on the commit, on the branch with the commit, and on the pull request with the commit. Because a single commit can involve multiple builds, the commit can have more than one build status."

[pinepain]

I've added some support for bitbucket build status in https://github.com/Block8/PHPCI/pull/1218, hope, you will find it helpful.