Add extension adding flash bag functionality #15
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When response headers or body was not set, the default was a frozen instance. Consequently, middlewares were unable to modify it using conventional destructive methods. For example, `rack-session` was unable to add `SET-COOKIE` header because it uses `Hash#[]`.
```ruby
require 'web_pipe'
require 'rack/session/cookie'
require 'rack-flash'
WebPipe.load_extensions(:flash)
class MyApp
include WebPipe
use :session, Rack::Session::Cookie, secret: 'secret'
use :flash, Rack::Flash
plug :put_in_flash, ->(conn) { conn.put_flash(:notice, 'Hello world') }
plug :put_in_flash_now, ->(conn) { conn.put_flash_now(:notice_now, 'Hello world now') }
end
```
For this extension to be used, `Rack::Flash` middleware must be added to
the stack (gem name is `rack-flash3`. This middleware in turns depend on
`Rack::Session` middleware.
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Add extension adding flash bag functionality
For this extension to be used,
Rack::Flashmiddleware must be added tothe stack (gem name is
rack-flash3. This middleware in turns depend onRack::Sessionmiddleware.