Crate

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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

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- Fix: Avoid invalid keyword argument error when fetching blobs from cluster
by removing certificate keywords before creating non-https server in pool.

- Testing: Made Crate test layer logging less verbose (hide Crate startup logs)
and added ``verbose keyword`` argument to layer to control its verbosity.