Update Exception Notification config to 4.x

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Update environment configs to new 1.9+ Hash syntax

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Fix Exception Notification require in Gemfile

Signed-off-by: Alex Coles <alex@alexbcoles.com>