Bumped to 2.47.0

boto v2.47.0
============

:date: 2017/05/24

Adds features for Google Cloud Storage.

Changes
-------
* Loosen requirements for ID field in PROJECT_PRIVATE_RE. (:issue:`3729`, :sha:`5e85d7c7`)
* Populate storage class from HEAD Object responses. (:issue:`3691`, :sha:`315b76e0`)


