Correct list_saml_providers to return all items

Added list_marker of SAMLProviderList so that all Providers are returned instead of just one
Update test_connection.py

Add unit tests for list_saml_providers
Update connection.py

Added Delivery to the documentation for Valid Values for notification_type boto/boto#2128
Add documentation for top-level S3 module
Mark Glacier as Python 3 compatible
Merge pull request #2338 from nanorepublica/patch-1

Correct list_saml_providers to return all items. Fixes #2338.
Merge pull request #2367 from nhumphreys/develop

Update documentation on Valid Values for ses:SetIdentityNotificationTopic. Fixes #2367.
Merge pull request #2379 from catlee/develop

Add documentation for top-level S3 module. Fixes #2379.