Relevant checks added for Google and Facebook authentication
Scenarios :
if user is first registered using local authentication and when he logs in using social auth, then the user model is linked to that social media account
if user logs in through social media and then later registers through local auth, user model is linked to that social media account
the identification of user happens through email here
Added logout button in the login page for testing purpose.
Relevant checks added for Google and Facebook authentication
Scenarios :
Added logout button in the login page for testing purpose.
fixes #37