Merge pull request #233 from moooji/fix/getToken

[v3] Fix getToken to return JWT token instead of user

Author: Salakar

ios/Firestack/FirestackAuth.m

@@ -314,7 +314,7 @@ @implementation FirestackAuth
             if (error) {
                 [self userErrorCallback:callback error:error user:user msg:@"getTokenError"];
             } else {
-                [self userCallback:callback user:user];
+                callback(@[[NSNull null], token]);
             }
         }];
     } else {
@@ -331,7 +331,7 @@ @implementation FirestackAuth
             if (error) {
                 [self userErrorCallback:callback error:error user:user msg:@"getTokenWithCompletion"];
             } else {
-                [self userCallback:callback user:user];
+                callback(@[[NSNull null], token]);
             }
         }];
     } else {