code: func (c *Client) ParameterizedBuild(account, repo, branch string, buildParameters map[string]string) (*Build, error) {
  	opts := map[string]interface{}{"build_parameters": buildParameters}
  	return c.BuildOpts(account, repo, branch, opts)
  }
docs: // ParameterizedBuild triggers a new parameterized build for the given
  // project on the given branch, Marshaling the struct into json and passing
  // in the post body.
  // Returns the new build information