title: Flush/Empty db in StackExchange.Redis
body: <p>I am using <a href="https://github.com/StackExchange/StackExchange.Redis/blob/master/Docs/Basics.md" rel="noreferrer">StackExchange.Redis</a> in my application to store key/values. I need to flush the entire db now which Redis is using. I found a way via command
  <a href="https://stackoverflow.com/questions/6851909/how-do-i-delete-everything-in-redis">How do I delete everything in Redis?</a>
  but how can I do this with StackExchange.Redis? I was not able to find any method for that?</p>
  
  <p>I searched for Empty, RemoveAll etc on IDatabase object and found nothing.</p>