module Github::Connection

def stack(options={}, &block)


addition of new extensions such as cache adapter.
Exposes middleware builder to facilitate custom stacks and easy 
def stack(options={}, &block)
  @stack ||= begin
    if block_given?
      Faraday::Builder.new(&block)
    else
      Faraday::Builder.new(&default_middleware(options))
    end
  end
end