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 'release-2.28.0'
Merge branch 'release-2.29.0'
Merge branch 'release-2.29.1'
Merge branch 'release-2.30.0'
Merge branch 'release-2.31.0'
Add release notes; bump to 2.31.1
Fixed #1698 and put unit tests on it
swf module: add backward-compatible support for Python 3.3+
cloudwatch module: add backward-compatible support for Python 3.3+
opsworks module: add backward-compatible support for Python 3.3+
Fetch key storage class on-demand.
support module: add backward-compatible support for Python 3.3+
Add unit tests, only fetch value if explicitly set
Merge pull request #2397 from felixonmars/swf-py3

swf module: add backward-compatible support for Python 3.3+. Fixes #2397.
Merge pull request #2400 from felixonmars/cloudwatch-py3

cloudwatch module: add backward-compatible support for Python 3.3+. Fixes #2400.
Merge pull request #2402 from felixonmars/opsworks-py3

opsworks module: add backward-compatible support for Python 3.3+. Fixes #2402.
No longer need to explicitly set to STANDARD for tests which call set_contents* methods