CI Build Tools

@constructor
function CI(pull_request, branch, build_number, builder) {
	this.pull_request = pull_request;
	this.branch = branch;
	this.build_number = build_number;
	this.builder = builder;

	this.GetVersion = GetVersion;
	this.GetPullRequest = GetPullRequest;
	this.PublishGitTag = PublishGitTag;
	this.MergeDownstream = MergeDownstream;
}