Do not send facebook secret to sentry.
Do not send facebook secret to sentry.

Raven sends whole stacktrace to sentry on exception and
removes secret from stacktrace, but not from extra.

Change-Id: I6bf1bc5a492fc5575f08410353d80e60aaa30de7
Reviewed-on: http://review.pozytywnie.pl:8080/19677
Tested-by: Jenkins
Reviewed-by: Tomasz Wysocki <dd7daed03936e0c371e2c3aa653cd5b196895201@pozytywnie.pl>

jgoclawski/django-facebook-auth,pozytywnie/django-facebook-auth,jgoclawski/django-facebook-auth,pozytywnie/django-facebook-auth