Merge branch 'v2' of https://github.com/wix/react-native-navigation into v2

lib/ios/RNNEventEmitter.m

 # pragma mark private
 
 -(void)send:(NSString *)eventName body:(id)body {
+    if ([eventName isEqualToString:componentDidDisappear] && self.bridge == nil) {
+        return;
+    }
 	[self sendEventWithName:eventName body:body];
 }