title: How do I specify a config file with play 2.4 and activator
body: <p>I am building a Scala Play 2.4 application which uses the typesafe activator.</p>
  
  <p>I would like to run my tests 2 times with a different configuration file for each run.</p>
  
  <p>How can I specify alternative config files, or override the config settings?</p>
  
  <p>I currently run tests with the command "./activator test"</p>