Features
- add configurable checksumming for blob uploads and downloads (#246) (23b7d1c)
- add support for 'Blob.custom_time' and lifecycle rules (#199) (180873d)
- error message return from api (#235) (a8de586)
- storage: add support of daysSinceNoncurrentTime and noncurrentTimeBefore (#162) (136c097)
- pass 'client_options' to base class ctor (#225) (e1f91fc), closes #210
- rename 'Blob.download_as_{string,bytes}', add 'Blob.download_as_text' (#182) (73107c3)
Bug Fixes
- change datetime.now to utcnow (#251) (3465d08), closes #228
- extract hashes correctly during download (#238) (23cfb65)
- repair mal-formed docstring (#255) (e722376)