regenerate appraisal:gemfiles
More tweaks to the driver gems before releasing

- Update the version handling.  Rather than string mangling, use
  simpler DRIVER_VERSION and VERSION constants.
- Invert the (never released) autoload property behavior.  Instead
  of requiring a property to opt in to the new behavior, require a
  property (arjdbc.force.autoload) to retain the old behavior.
always warn when loading on non-JRuby + review autoloading
change generic autoload controll option name to jdbc.driver.autoload (provides backward-compatibility with AR-JDBC < 1.2.3 as well as other libraries) + provide a specific autoload option as well ...