Fixed broken complete callback for login

Signed-off-by: Alexander Shorin <kxepal@apache.org>
diff --git a/jquery.couch.js b/jquery.couch.js
index ffbad34..7252548 100644
--- a/jquery.couch.js
+++ b/jquery.couch.js
@@ -218,6 +218,9 @@
           } else {
             throw 'An error occurred logging in: ' + resp.reason;
           }
+          if (typeof options.complete === "function") {
+            options.complete();
+          }
         }
       });
     },