Http Server Timing headers

Introduction
This Joomla plugin enable Server Timing HTTP headers. See https://w3c.github.io/server-timing/
HTML(5) Server Timing API
It help you track performance of your website in the browser console (supported by google chrome)[https://developers.google.com/web/tools/chrome-devtools/network-performance/understanding-resource-timing]
This plugin must run as the last plugin in system group. You need to reorder plugins and put it as the last
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How to use it
Use the global Joomla profiler to profile you code
```php
$profiler = JProfiler::getInstance('Application');
// profile sections of your code
$profiler->mark('afterParseImages');
$body = GzipGZipHelper::parseCss($body, $options);
$profiler->mark('afterParseCss');
$body = GzipGZipHelper::parseScripts($body, $options);
$profiler->mark('afterParseScripts');
$body = GzipGZipHelper::parseURLs($body, $options);
$profiler->mark('afterParseURLs');
```
Open the google chrome console and navigate to the network tab. Click on your page request. Click the timing tab. You will see the result.
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