Inactive/spammy Users cleanup

[tochman]

Users that have not logged in to the app for 6 months.

Solution: I ran a query that updated the display_profile attribute to false for all members that have not been logged in to WSO for 6 months. That took care of the problem partially.

We would probably need a mechanism in place to activate the accounts by confirming the email. There is a module for that in Devise.

[mattlindsey]

I ran a destroy_all on all except 33 users who appear real with actual github accounts, and only way to sign up now is with github, so hopefully we're OK for a while. Still might want confirmation emails at some point.