fix config file path

Used config_dev.yml because bundle only enabled in dev and test env
Merge pull request #15 from mcg-web/patch-1

fix config file path
change config to accept many managers
integrate manay managers
fix bug and add tests
fix InvalidArgumentException: randomNumber() generates numbers of fixed width. To generate numbers between two boundaries, use numberBetween() instead.
Merge branch 'feature/many-managers'