Add support for next_token to get_all_reservations, and have
get_only_instances use it to fetch all results.
add test that next_token is properly passed from get_all_reservations to
DescribeInstances call
Merge pull request #2189 from catlee/master

Add support for next_token to EC2 get_all_reservations. Fixes #2189.
Merge branch 'master' of https://github.com/boto/boto into develop
Add AAAA functions to Route 53 Zone class & tests