Assorted changes to get specs to green.  Clean up memcached processes after creation, so the processes aren't reused.  Remove use of the 'second' method on Array (added by ActiveSupport).  Fix Travis rbx keys.  Set value on stats spec, so it doesn't depend on server processes from other specs.
Eliminate duplicate Dalli::Client
Disable minitest/pride under Rubinius, because Rubinius specs exit improperly with this extension
Merge pull request #467 from petergoldstein/feature/get_specs_passing

Assorted changes to get specs to green.