Move '_scalar_property' to '_helpers'.

Also, add explicit coverage for it.
Map 'Bucket.location' to a simple, scalar property.
Re-map 'Bucket.versioning' as a boolean property, 'versioning_enabled'.
Map HTTP error responses for storage onto specific exception classes.

Fixes #164.
Merge pull request #353 from tseaver/refactor-bucket_scalar_properties

Refactor bucket scalar properties
Recursively walk subclass tree to build code->exception class mapping.
Merge pull request #355 from tseaver/164-add_http_specific_exceptions

Fix #164:  Map HTTP error responses for storage onto specific exception classes.
Open privkey file in binary mode.

Fixes #361.
Merge pull request #362 from tseaver/361-open_privkey_file_in_binary_mode

Open privkey file in binary mode.
Float backlink right in source view.

Fixes #84.
Merge pull request #365 from tseaver/84-float_viewcode_backlinks_right

Fix #84. Float backlink right in source view.
Fix regression tests broken by 36966e8.

See https://travis-ci.org/GoogleCloudPlatform/gcloud-python/builds/40569737.
Merge pull request #367 from tseaver/347-fix_regression_tests_after_36966e8

Fix regression tests broken by 36966e8.
Avoid confusing pylint's 'missing-format-attribute'.
Rename '_get_protobuf_attribute_and_value'->'_pb_attr_value'.

Helper, not API;  unused outside 'gcloud.datastore.helpers'.

Removes pylintrc wart.
Annotate base pylintrc.

Generated from 'pylint --generate-rcfile'.

Defaults are commented out.

Exceptions to defaults include a rationale.

Note generation of 'pylintrc_reduced'.
US speling.
Moar speling.
Update 'max-locals' as needed by #364.
Merge pull request #368 from tseaver/annotate_pylintrc_w_defaults_and_rationale

Annotate pylintrc w defaults and rationale