Add ConnectedStateCoalescingInterval, fixes #29

Author: fchasen

StaticServerExample/App.js

@@ -50,7 +50,7 @@ export default class App extends Component<Props> {
 
     download.promise.then(() => {
       // Create a StaticServer at a random port
-      this.server = new StaticServer(this.port, this.root, {localOnly: true});
+      this.server = new StaticServer(this.port, this.root, {localOnly: true, keepAlive: true});
 
       return this.server.start().then((origin) => {
         this.setState({origin});

ios/FPStaticServer.m

@@ -93,6 +93,7 @@ - (dispatch_queue_t)methodQueue
 
     if (self.keep_alive == YES) {
         [options setObject:@(NO) forKey:GCDWebServerOption_AutomaticallySuspendInBackground];
+        [options setObject:@2.0 forKey:GCDWebServerOption_ConnectedStateCoalescingInterval];
     }