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[fixed] respect closeTimeoutMS during unmount

Fixes issue #17: "When the modal is unmounted, it will abruptly close,
not waiting for any animations to finish."

The bug was caused by the Modal component unmounting the portal
immediately in `componentWillUnmount` regardless of whether the portal
is currently closing or would animate to close.

Now when a Modal has a non-zero `closeTimeoutMS`, the Modal inspects the
portal state before closing.  If the portal is open or closing, but not
closed, it waits to unmount the portal.  If the portal is open and not
already closing, the Modal calls closeWithTimeout() to trigger the
close.

Adds test to ensure portal DOM persists after Modal is unmounted when
the Modal has a `closeTimeoutMS` set.  Updates existing tests to
properly unmount test Modal instances.

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