added ability to look up constructors as Invokables
refactored json internals to use Reflections2
Merge pull request #1210 from jclouds/gson-typetoken

Gson internals refactor
ensure identity/credential properties are not needed when using credential supplier
added AWS temporary security credentials and integrated with FormSigner
integrated s3 request signing with temporary credentials
Merge pull request #1215 from jclouds/aws-temporary-credentials

Aws temporary credentials