Support JavaScriptSupport scripts when messages arrive

[uklance]

Currently, only the html content is sent from the component event.
Investigate running any javascript (added via JavascriptSupport) at the same time.

@see PushManagerImpl.java:75

Also see

Tapestry.loadScriptsInReply: function (reply, callback) {
   ...
}

Related to #23

[uklance]

JavaScriptSupport is not set on the Environment, perhaps ComponentRequestHandler is too far down the chain. I might need to use AjaxPartialResponseRendererImpl instead. Need to put a breakpoint in JavaScriptSupportImpl's constructor to see when it is instanciated for a normal ajax call.

Need to investigate the DocumentLinker too (for js and css includes).

@see http://tapestry.1045711.n5.nabble.com/Async-process-ComponentRequestHandler-and-JavaScriptSupport-td5714401.html

[uklance]

Fixed but you need to use AjaxResponseRenderer instead of JavaScriptSupport directly.

https://github.com/uklance/tapestry-cometd/wiki/Pushing-javascript-to-the-client