Add social login

[ernestofgonzalez]

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[ernestofgonzalez]

A super fast way of doing this is integrating django-allauth, but one thing I want to continue doing is using function based views (see Django Views - The right Way). Plus I think it will be fun to try to implement it myself.

[ernestofgonzalez]

I'll start by adding support for login with Google, since it's the more common one.

[ernestofgonzalez]

Actually, I changed my mind. I'm going ahead with django-allauth, but I'm not going to use its views.

[ernestofgonzalez]

Apparently django-allauth does not provide an API to integrate social auth without using their views. I could plug in some of their providers, but it defeats the purpose.

I'm using Sign in with Google for Google. Since this is a SaaS-oriented boilerplate, the more common social auth would be Google, GitHub and maybe Twitter.

For now, only Google will be supported, and if in the future we decide to add GitHub and Twitter, the necessary work to do it will be larger than if we just stick with django-allauth, but still neglectable.