Bring gcs-oauth2-boto-plugin back up to 1.8
Cleanup: logging, whitespace, coding header, and linting.

* Convert logging calls that were using % instead of arguments to the logging
  function.
* Remove several places that had trailing whitespace.
* Standardize on a coding header and use it for all files.
* Fix a few linter errors.
Remove open_wb option from CreateTempFile.

There's really no reason we would ever want to open a file in text mode on
Windows. Also fixed linter errors in test_Doption.py.
Amendments to 4.6 release notes
Update CHECKSUM and VERSION for 4.6 release.
Fix a couple minor eventual consistency issues in test_cp
Fix timestamp output format in perfdiag.
Fix unit test shutdown exception in Python 2.6.
tests pass
update boto
Adjust wording for canned ACLs to be clearer