add listenTo option

index.js

@@ -31,6 +31,7 @@ module.exports = Delegator
 
 function Delegator(opts) {
     opts = opts || {}
+    var additionalEvents = opts.listenTo || [];
     var document = opts.document || globalDocument
 
     var cacheKey = document[cacheTokenKey]
@@ -47,9 +48,10 @@ function Delegator(opts) {
             new DOMDelegator(document)
     }
 
+    var events = commonEvents.concat(additionalEvents);
     if (opts.defaultEvents !== false) {
-        for (var i = 0; i < commonEvents.length; i++) {
-            delegator.listenTo(commonEvents[i])
+        for (var i = 0; i < events.length; i++) {
+            delegator.listenTo(events[i])
         }
     }
 

test/dom-delegator.js

@@ -79,3 +79,28 @@ test("delegator with no args", function (assert) {
         assert.end()
     })
 })
+
+test("delegator with listenTo", function (assert) {
+    var elem = h("div")
+    document.body.appendChild(elem)
+
+    Delegator({
+        listenTo: ["mouseout"]
+    })
+    var values = []
+
+    addEvent(elem, "mouseout", function (ev) {
+        values.push(ev)
+    })
+
+    var ev = createEvent("mouseout")
+    elem.dispatchEvent(ev)
+
+    setImmediate(function () {
+        assert.equal(values.length, 1)
+        assert.equal(values[0].target, elem)
+
+        document.body.removeChild(elem)
+        assert.end()
+    })
+});