Crate-smartnow

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- Added ``duration`` property to the cursor displaying the server-side duration.
Show this value at the `crash` crate cli now instead of client-side duration.

- Added `readline` as a requirement package on OS X (Darwin), fixes umlauts problem.

- Fix sqlalchemy: raise exception if timezone aware datetime is saved

- Fix: raise concrete exception while uploading blobs to an index with disabled blobs support

- crash: check if given servers are available
and retrieve some basic information on connect command

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- Fix: show rows affected at `crash` on ``copy`` command

- crash: Added persistent history stored in platform dependent app-dir

- crash: Added support for multiple hosts for ``crash --hosts ...`` and the connect cmd

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- Added SQL ``copy`` command support to `crash` crate cli

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- crate layer: set working directory on layer instantiation instead of start hook

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- fixed sqlalchemy datetime parsing that didn't work with crate >= 0.18.4 due
to the fixed datetime mapping.

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- documented SQLAlchemy count() and group_by() support.