title: Abort a query for pouchdb
body: <p>I am using pouchdb in my react application. I have a find query and i want to abort the query if another find query is sent before I get a result to the previous query.(for live querying).</p>
  
  <p>Something like the db.killOp() of MongoDb</p>
  
  <p>Anyone can help me with this?</p>
  
  <p>Thanks in Advance!</p>