Adding updated values for recurring autoscale operations
Adding updated documentation for the new variables
Add sphinx extension for linking to github
Update release notes to use the new sphinx roles
Added tests for the EBS Optimized change.
Added a failing test for no results to DDBv2.
Solving bugs on empty results and between comparisions

When it returns empty result the result _results_left is true by
default and it tries to get data that doesn't exist.
When a between condition is added on the query the parameters needs to
be two separated string values ( not a SS field )
Updated tests to accommodate the changes to ``_build_filters``.
Added support for web identity federation.
Fixed headers in EC2 autodocs.
Added release notes for v2.9.5.
Fixed a bug where an instance variable was not present in the low-level DynamoDB client.
Updated release notes.
Bumping version to 2.9.5
Slight release notes tweak.
Fixed a bug where a ``date`` couldn't be set as metadata on a S3 key.
Modify enumerate calls to not use the 'start' param as it is not supported in Python/Jython (2.5)
Added a failing test for ``nextToken`` in ``InstanceStatusSet``.
fix typo in xml parsing for InstanceStatusSet

The correct XML element name is 'nextToken', not 'NextToken'. (http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-DescribeInstanceStatus.html)
Added a testcase to try to demonstrate #443.