fix(browserTrigger): support CompositionEvent

Author: Narretz

src/ngMock/browserTrigger.js

@@ -132,6 +132,10 @@
       evnt.keyCode = eventData.keyCode;
       evnt.charCode = eventData.charCode;
       evnt.which = eventData.which;
+    } else if (/composition/.test(eventType)) {
+      evnt = new window.CompositionEvent(eventType, {
+        data: eventData.data
+      });
     } else {
       evnt = window.document.createEvent('MouseEvents');
       x = x || 0;