Investigate if it makes sense to include the middleware to compress all responses

[oriolbcn]

• Check also if Nginx is already doing it or not.
• Check if it can provoke issues.
• Maybe it can be configured at the Nginx level instead?

https://schneems.com/2017/11/08/80-smaller-rails-footprint-with-rack-deflate/

[pablorc]

The actors involved in each stack could vary, so a only Nginx level solution is not ideal.

We are going to add support at middleware level to compress always and notify the users to be aware of this behaviour (so they can move it to app servers, or remember to disable the compression there).

As a note, a request compresses twice won't work in browsers.