title: How to use XCGLogger in a framework
body: <p>I want to use XCGLogger inside of a Swift framework I'm writing. The app that includes this framework may or may not use XCGLogger as well. </p>
  
  <p>What's the best way to approach this sort of scenario? Would I use something like dependency injection to let the app send the XCGLogger instance to the framework? Where in the framework would I call XCGLogger's setup method?</p>