* Add DB() support for Redis driver
* Added support for DB() to all drivers
* Fixed typo in README and Lint issue
* Fix lint issue with ristretto db
* Fix lint issue with bbolt db
* Rename DB() to Conn()
* Replace all instances of _DB with _Conn
* Update all the README files
* Return ArangoDB Client instead of DB
Right now, the default connection for postgres is `disable`. Some
databases require `verify` or even `required`.
This PR introduces a new implementation that allows the user to override
the `disable` mode. The PR keeps a backwards compatible config entry, that
sets the default behavior to `disable` if it's missing.
