triggerHandler() to accept custom event
In some scenarios you want to be able to specify properties on the event that is passed to the event handler. JQuery does this by overloading the first parameter (`eventName`). If it is an object with a `type` property then we assume that it must be a custom event. In this case the custom event must provide the `type` property which is the name of the event to be triggered. `triggerHandler` will continue to provide dummy default functions for `preventDefault()`, `isDefaultPrevented()` and `stopPropagation()` but you may override these with your own versions in your custom object if you wish. In addition the commit provides some performance and memory usage improvements by only creating objects and doing work that is necessary. This commit also renames the parameters inline with jQuery. Closes #8469
AngularJS 
AngularJS lets you write client-side web applications as if you had a smarter browser. It lets you use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. It automatically synchronizes data from your UI (view) with your JavaScript objects (model) through 2-way data binding. To help you structure your application better and make it easy to test, AngularJS teaches the browser how to do dependency injection and inversion of control. Oh yeah and it also helps with server-side communication, taming async callbacks with promises and deferreds; and makes client-side navigation and deeplinking with hashbang urls or HTML5 pushState a piece of cake. The best of all: it makes development fun!
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