Bigml

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- Fixing update annotations function when creating annotated images sources.

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- Adding new option to api.ok to report progress via a function callback.

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- Fixing bug in api.ok: response to failing API calls.

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- Upgrading dependencies.

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- Adding new local Pipeline object to encapsulate and run prediction
workflows.
- Changing ``api.ok`` response to return as False when retrieving faulty
resources. Previously, only problems retrieving the API response cause
``api.ok`` returning False.
- Adding FaultyResource exception to inform about that type of failure when
using the ``raise_on_error`` flag in ``api.ok``.
- Fixing bug in local LogisticRegression when predicting with operating points.

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- Adding local Dataset class to handle Flatline transformations.