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.
Don't remap (only some) IOError.

Fixes bug for errno != ENOSPC.
Don't suppress coverage for gcloud.storage.key.Key.generate_signed_url.
Don't suppress coverage for gcloud.connetion.Connection.generate_signed_url.

Borrow @dhermes' factoring of '_get_expiration_seconds', but make it
a free function rather than a static method, and make the testes more
fine-grained.
Drop 'pragma: NO COVER' for '__repr__' methods.

Suppress coverage for them instead via .coveragerc.
Document non-coverage of non-testing path through '_utcnow'.
Drop comments replicating docstring info.

Incorporates feedback from @dhermes.
Fix fussiness introduced by .coveragerc change.
Avoid extra 'if _UTCNOW is not None:' check.

Incorporate feedback from @dhermes.
lint.
Dead chickens for pep8 E124.
Typo.

Incorporate feedback from @dhermes.
Merge branch 'master' into 239-remove_pragma_no_cover
Merge with master to pick up PR #250.
Merge pull request #248 from tseaver/239-remove_pragma_no_cover

Fix #239: remove / document 'pragma: NO COVER'