Add sphinx extension for linking to github
Update release notes to use the new sphinx roles
Added support for web identity federation.
Merge branch 'github-links' into develop

* github-links:
  Update release notes to use the new sphinx roles
  Add sphinx extension for linking to github
Merge branch 'wif' into develop
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
Merge branch 'release-2.9.5' into develop

* release-2.9.5:
  Bumping version to 2.9.5