make sure we require arjdbc instead of just arjdbc/jdbc from adapters
load out raltie from arjdbc instead of activerecord-jdbc-adapter
thus it will work consistently even if only a specific adapter gem is specified in Bundler's Gemfile
support auto-loading of adapter gems e.g. when specified in a Gemfile
no need for a ArJdbc::Version module simply use VERSION; at 1.3.0.DEV