Fix broken key options

noticed while porting the tests
diff --git a/jquery.couch.js b/jquery.couch.js
index f368b2a..561d6f4 100644
--- a/jquery.couch.js
+++ b/jquery.couch.js
@@ -792,6 +792,11 @@
                 : "(" + reduceFun.toString() + ")";
             body.reduce = reduceFun;
           }
+          if (options["keys"]) {
+            var keys = options["keys"];
+            delete options["keys"];
+            body.keys = keys;
+          }
           return ajax({
               type: "POST",
               url: this.uri + "_temp_view" + encodeOptions(options),