Add support for SES API 2010-12-01 methods: SetIdentityFeedbackForwardingEnabled and SetIdentityNotificationTopic #2128
added test cases for #2128
Fixed default IAM policy documents in cn-north-1.
Comments about where else to update code.
Fixed ``get_signin_url`` behavior.

This is pretty much broken right now. This improves it & should make cn-north-1 work correctly now as well.
Merge pull request #2130 from nhumphreys/ses-notification-support

Add SetIdentityFeedbackForwardingEnabled and SetIdentityNotificationTopic for SES. Fixes #2130, #2128.
Merge branch 'iam-improvements' into develop

Fixes #2152.