S3 Event Source delete function not working as expected

[olabhrad]

The S3 Event Source delete function is not working as expected. This is tangentially related to issue #88. The delete function expects that only one notification has been set up. It checks the first entry in"CloudFunctionConfiguration" to see if the function arn matches. If it does, it removes the whole "CloudFunctionConfiguration" block.

This in incorrect for two reasons:

• If a different notification has been set up and appears before the expected notification, the expected notification will not be deleted.
• If a different notification has been set up and appears after the expected notification, the expected notification and the other notification will both be deleted.

EDIT:
It's not that the code checks for the first entry in "CloudFunctionConfiguration" it's that it uses the deprecated get-bucket-notification which only returns the first notification. The result is still the same.

[olabhrad]

PR: #86