Sendgrid email configuration

If we insert a username/password we can have email enabled by using
django.core.email...
Merge branch 'master' into examples
Revert "Chalearn Cause-Effect Example"

This reverts commit 889cfc4a128af233396a6e5fcc2da1020884f1e9.
updated ChaLearn Cause Effect content.
Updated conditions

Questions outstanding before final changes can be finished.