Make secure cookie flag optional

[mig-hub]

Hello,

After the discussion we had on the issue page with thibaudgg, here is my fork for having secure cookie flag optional.

It includes tests, a warning and documentation.

Let me know what you think.

Thank you very much,
Mig

[tobmatth]

Hey there,

thanks for your contribution, looks good so far. I'll pull in your changes tomorrow unless @rymai or @thibaudgg are faster :)

Regards,
Tobi

[rymai]

Hey,

I've merged this, and also made some cleaning in the code, there is still need to clean up stuff I think but it's a first step...