download_to_fileobj() implementation per boto/boto#1941
Unit tests for new methods added in boto/boto#1960
Require a string value to instantiate Binary DynamoDB type

Prevents incorrect usage which results in potentially confusing errors.
Fixes #1956.
Fixed to no longer duplicate issues in release notes.
Merge pull request #1960 from oxtopus/issue-1941-download_to_fileobj

Glacier download_to_fileobj implementation. Fixes #1960.
Set security token via environment or config file

Support AWS_SECURITY_TOKEN environment variable and
aws_security_token in the config file.  Unit tests and doc change
included.  Ignored updating core/ as I assume core is abandoned in
favor of the separate botocore project.
Add support for arbitrary dict inputs to MWS calls
PEP8
Add unit tests for instantiating the DynamoDB Binary type.
Merge pull request #1963 from danielgtaylor/ddb-binary

Require a string value to instantiate Binary DynamoDB type. Fixes #1963, #1956.
Merge branch 'rn-issue-dupe-fix' into develop
Fixes #1965
Altered cert failure checks for regions.

This should make the integration tests happier.