Firestack configuration WIP

Author: auser

ios/Firestack/Firestack.h

@@ -14,7 +14,6 @@
     FIRAuthStateDidChangeListenerHandle authListenerHandle;
 }
 
-+ (Firestack *) getInstance;
 + (void) registerForNotification:(NSString *) typeStr andToken:(NSData *)deviceToken;
 
 @property (nonatomic) BOOL debug;

ios/Firestack/Firestack.m

@@ -73,6 +73,10 @@ @implementation Firestack
     if (![opts valueForKey:@"trackingID"] && [opts valueForKey:@"googleAppID"]) {
         [props setValue:[opts valueForKey:@"googleAppID"] forKey:@"trackingID"];
     }
+
+    if (![opts valueForKey:@"androidClientID"] && [opts valueForKey:@"clientID"]) {
+        [props setValue[opts valueForKey:@"clientID"] forKey:@"androidClientID"];
+    }
 
     @try {
         FIROptions *finalOptions = [[FIROptions alloc]