Remove all TODOs from code

[dhermes]

A quick check gives:

$ grep -ir todo .
./tox.ini:# TODO: add py32,py33,py34
./gcloud/datastore/helpers.py:    # TODO(jjg): Should we raise a ValueError here?
./gcloud/datastore/key.py:  # TODO: Determine if this really should be immutable.
./gcloud/datastore/query.py:# TODO: Figure out how to properly handle namespaces.
./gcloud/datastore/query.py:    # TODO(jjg): Double check that this makes sense...
./gcloud/datastore/query.py:    # TODO: Do we want this to be additive?
./gcloud/datastore/connection.py:    # TODO: Is this the right method name?
./gcloud/datastore/connection.py:    # TODO: How do you delete properties? Set them to None?
./gcloud/datastore/connection.py:    # TODO: Make this return value be a True/False (or something more useful).
./gcloud/datastore/connection.py:    # TODO: Is this the right way to handle deleting
./gcloud/datastore/entity.py:    # TODO(jjg): Raise an error if something dumb happens.
./gcloud/datastore/entity.py:    # TODO: Make sure that this makes sense.
./gcloud/storage/iterator.py:  # TODO: Use an actual HTTP streaming library,
./gcloud/storage/key.py:    # TODO: If a bucket isn't defined, this is basically useless.
./gcloud/storage/key.py:    # TODO: Add good error checking.
./gcloud/storage/key.py:    # TODO: Add good exception handling.
./gcloud/storage/key.py:    # TODO: Set timestamp? Make optional, default being to set it if possible?
./gcloud/storage/key.py:      # TODO: Error checking for response code.
./gcloud/storage/key.py:      # TODO: Exponential backoff when errors come through.
./gcloud/storage/key.py:    # TODO: How do we handle NotFoundErrors?
./gcloud/storage/key.py:    # TODO: This might be a VERY long list. Use the specific API endpoint.
./gcloud/storage/bucket.py:    # TODO: Make sure the proper exceptions are raised.
./gcloud/storage/bucket.py:    # TODO: Should we accept a 'silent' param here to not raise an exception?
./gcloud/storage/bucket.py:    # TODO: What should be the return value here?
./gcloud/storage/bucket.py:    # TODO: What do we do about overwriting data?
./gcloud/storage/bucket.py:    # TODO: This might be a VERY long list. Use the specific API endpoint.
./gcloud/storage/connection.py:    # TODO: Add better error handling.
./gcloud/storage/connection.py:      # TODO: Better checking on this header for JSON.
./gcloud/storage/connection.py:    # TODO: URL-encode the bucket name to be safe?
./gcloud/storage/connection.py:    # TODO: Which exceptions will this raise?
./gcloud/storage/exceptions.py:# TODO: Make these super useful.
./gcloud/storage/__init__.py:# TODO: Allow specific scopes and authorization levels.
./gcloud/storage/acl.py:      # TODO: Add validation of types.

I will be removing all these from the code and filing a bug for each.

[dhermes]

Created https://github.com/dhermes/gcloud-python/tree/move-todos-to-issue-tracker to track this.

[dhermes]

First step b5e8322

[dhermes]

I think dhermes@f4a9412 doesn't require a follow-up bug. WDYT @silvolu?