Add in support for grabbing linkedin emails
Add in support for grabbing linkedin emails

Linkedin as of today allows developers to grab the user's email address 
along with a bunch of other attributes as explained in their blog post here: 
https://developer.linkedin.com/blog/making-it-easier-you-develop-linkedin

They are using a oauth2-like "scope" parameter to allow applications to 
request extended permissions, which I was able to hook into by adding
LINKEDIN_REQUEST_TOKEN_EXTRA_ARGUMENTS = {'scope':'r_emailaddress r_contactinfo}'}
to settings.py. 

Note: if you have an old linkedin api key, you have to generate a new one 
to use the new goodies, or wait until they provide a migration path.
lovehhf/django-social-auth,MjAbuz/django-social-auth,VishvajitP/django-social-auth,getsentry/django-social-auth,vxvinh1511/django-social-auth,mayankcu/Django-social,sk7/django-social-auth,omab/django-social-auth,VishvajitP/django-social-auth,WW-Digital/django-social-auth,omab/django-social-auth,lovehhf/django-social-auth,adw0rd/django-social-auth,dongguangming/django-social-auth,vuchau/django-social-auth,vuchau/django-social-auth,michael-borisov/django-social-auth,qas612820704/django-social-auth,limdauto/django-social-auth,beswarm/django-social-auth,michael-borisov/django-social-auth,beswarm/django-social-auth,vxvinh1511/django-social-auth,duoduo369/django-social-auth,MjAbuz/django-social-auth,limdauto/django-social-auth,caktus/django-social-auth,qas612820704/django-social-auth,gustavoam/django-social-auth,dongguangming/django-social-auth,caktus/django-social-auth,gustavoam/django-social-auth,krvss/django-social-auth