Plugin system improvements

+ piwik analytics plugin (not tested)

plugins/piwik-analytics/index.php

@@ -0,0 +1,35 @@
+<?php
+
+class PiwikAnalyticsPlugin extends \RainLoop\Plugins\AbstractPlugin
+{
+	/**
+	 * @return void
+	 */
+	public function Init()
+	{
+		if ('' !== $this->Config()->Get('plugin', 'account', ''))
+		{
+			$this->addJs('js/include.js');
+		}
+	}
+	
+	/**
+	 * @return array
+	 */
+	public function configMapping()
+	{
+		$oUrl = \RainLoop\Plugins\Property::NewInstance('piwik_url')->SetLabel('Piwik URL')
+			->SetAllowedInJs(true);
+
+		$oSiteID = \RainLoop\Plugins\Property::NewInstance('site_id')->SetLabel('Site ID')
+			->SetAllowedInJs(true);
+
+		if (\method_exists($oUrl, 'SetPlaceholder'))
+		{
+			$oUrl->SetPlaceholder('http://');
+			$oSiteID->SetPlaceholder('');
+		}
+
+		return array($oUrl, $oSiteID);
+	}
+}