go1.8: support for additional features

[kardianos]

Many new important features will land in go1.8. Please see document: https://docs.google.com/document/d/1F778e7ZSNiSmbju3jsEWzShcb8lIO4kDyfKDNm4PNd8/edit?usp=sharing for the full list.

Because these features are new we want drivers to implement them before they are released. Ideally they should be implemented by 2016-12-12 to allow for any driver provided feedback from implementation if necessary.