Crate-smartnow

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- Testing: Prevent the process.stdout buffer from filling up in the test layer
which in turn would cause the process to block

- Raise more meaningful `BlobLocationNotFoundException` error when
trying to upload a file to an invalid blob table.

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- Testing: Added support for setting environment variables.

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- BREAKING: Dropped Crate version < 1.0.0 support for Crate test layer

- Testing: Dropped ``multicast`` support for Crate test layer

- Added support for ``Insert`` from select to the SQLAlchemy dialect

- sqlalchemy: support `get_columns` and `get_pk_constraint`

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- BREAKING: Dropped support for SQLAlchemy < 1.0.0

- Fix sqlalchemy: crate dialect didn't work properly with alpha and beta
versions of sqlalchemy due to a wrong version check
(e.g.: sandman2 depends on 1.1.0b3)

- sqlalchemy: added support for native Arrays

- Fix sqlalchemy: ``sa.inspect(engine).get_table_names`` failed due
to an attribute error

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- Added compatibility for SQLAlchemy version 1.1

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- Fix sqlalchemy: updates in nested object columns have been ignored