Add django-sslserver to development settings

[Hugo Fonseca]

https://github.com/teddziuba/django-sslserver

Gives the ability to use runserver with a self-signed ssl certificate, useful for some project cases where SSL is needed to use certain feature of the browser.

[Nuno Khan]

@pslobo what do you think?? seems useful do me..

@Kapz how does the certificate generation work? it has to be manual??

[Hugo Fonseca]

@psychok7 the certification is generated automatically on the first run of runsslserver

[Nuno Khan]

I like the idea, will test it myself for a while and if it panes out i don't see why we shouldn't add to the project

[Pedro Lobo]

@psychok7 Looks interesting indeed. This combined with Certbot container means full SSL support from dev to staging and production.