class Github::Repos

def branches(user_name=nil, repo_name=nil, params={})
  _update_user_repo_params(user_name, repo_name)
  _validate_user_repo_params(user, repo) unless (user? && repo?)
  response = get("/repos/#{user}/#{repo}/branches", params)
  return response unless block_given?
  response.each { |el| yield el }
end