Merge branch 'release-2.9.6' into develop

* release-2.9.6:
  Bumping version to 2.9.6
Implemented a high-level interface for selecting specific attributes and select=Count.
Add tests for specific attributes query
Fixed typo in boto.connection
Merge remote-tracking branch 'EnTeQuAk/patch-1' into develop
Merge remote-tracking branch 'EnTeQuAk/partial_select_and_count' into develop
Small test cleanup from the previous merge.
Updated RDS to use SigV4.
Added a note about considering DynamoDB.
Backfilled the release notes from the wiki.
Removed StorageUri parse check for lone ':' (interferes with using filenames containing :)
Return more information about gs key generations for parallel composite uploads.
Merge pull request #1571 from zwilt/develop

Return more information about gs key generations.
Fix error in docs for get_all_tags.
Make upload header handling case-insensitive.
Merge pull request #1575 from lotten/caseSensitiveFix

Make upload header handling case-insensitive.
Fix for CF resource timestamps with milliseconds
Fixed an error in the S3 tutorial examples.
Corrected some imports in the DDBv2 tutorial.
Fixed an error in the ``get_key_pair`` docstring.