adds config_file_location for AR setup to address different setups
adds config_file_location for AR setup to address different setups

DatabaseCleaner/database_cleaner,avalonmediasystem/database_cleaner,claptimes5/database_cleaner,stanislaw/database_cleaner,yangc5/playlister-sinatra-v-000,glebtv/database_cleaner,HaiTo/database_cleaner,DatabaseCleaner/database_cleaner,reinaris/database_cleaner,0xCCD/database_cleaner,yangc5/playlister-sinatra-v-000,yangc5/playlister-sinatra-v-000,yangc5/playlister-sinatra-v-000,gentoo/database_cleaner,eliotsykes/database_cleaner,yangc5/playlister-sinatra-v-000,ericraio/database_cleaner,awilkening/database_cleaner,yangc5/playlister-sinatra-v-000,yangc5/playlister-sinatra-v-000,custora/database_cleaner,fajrif/database_cleaner,amorphid/database_cleaner,simonmorley/database_cleaner