Add docstrings to pacify pylint.

See https://github.com/GoogleCloudPlatform/gcloud-python/pull/238#issuecomment-58954981.
Typo.

Incorporate feedback from @dhermes.
Avoid 'wrapper' in module docstrings.

Incorporate feedback from @dhermes.
PEP8:  single-line docstrings.

Incorporate feedback from @dhermes.
PEP8:  this time for sure, Rocky
Merge pull request #240 from tseaver/docstrings-datastore

Add gcloud.* and gcloud.datastore.* docstrings to pacify pylint.
Documenting undocumented classes/methods/etc. in gcloud.storage.

Also did tiny clean-up along the way in places I noticed
code issues.

Another thing, I suggest a rename of _bytes_written in
storage.iterator.KeyDataIterator to something like
_bytes_read or _bytes_consumed, i.e. something which
actually matches the action being taken.
Merge pull request #241 from dhermes/docstrings-storage

Documenting undocumented classes/methods/etc. in gcloud.storage.
build: update docs after merge to master
Merge pull request #245 from silvolu/update-docs-on-merge

build: update docs after merge to master
Typo.

Fixes warning in 'tox -e docs'.
Wrap lines at 79 charcters.

Fixes PEP8 E501 errors in 'tox -e lint'.
Fix PEP8 E301 error.
Rename helper memor to indicate usage.

Expected argument is a Property protobuf.
Factor out value_pb bits from '_get_value_from_property_pb'.
Add support for 'list_value' field of a Value protobuf.

Fixes #223.

Manually lands Tagtoo@0475d5e, included by mistake in PR #126.
Don't suppress coverage for gcloud.datastore.key.Key.parent.
Add explicit coverage for gcloud.datastore.acl.ACL.get_entities.
Don't suppress coverage for gcloud.storage.acl.ACL.save.
Don't suppress coverage for gcloud.storage.iterator.Iterator.get_items_from_response.