Use _.invokeMap instead of _.invoke. [closes #157]

Author: jdalton

example/jsperf/ui.js

@@ -704,7 +704,7 @@
     setTimeout(function() {
       ui.off();
       ui.browserscope.post = function() {};
-      _.invoke(ui.benchmarks, 'off');
+      _.invokeMap(ui.benchmarks, 'off');
     }, 1);
   }
 

plugin/ui.browserscope.js

@@ -305,7 +305,7 @@
    */
   function createSnapshot() {
     // clone benches, exclude those that are errored, unrun, or have hz of Infinity
-    var benches = _.invoke(filter(ui.benchmarks, 'successful'), 'clone'),
+    var benches = _.invokeMap(filter(ui.benchmarks, 'successful'), 'clone'),
         fastest = filter(benches, 'fastest'),
         slowest = filter(benches, 'slowest');