Silex p2ee/partlet demo

This is a very quick and simple integration of the p2ee/partlets into a silex application

try the example URLs:

• /home/Home.html
• /content/News.html
• /content/NewsItem.html?title=hawhaw&text=how%20how%20how
• /dynamic/JsonItemTest.html (added by https://github.com/P2EE/silex-partlet-demo/commit/a02e61bd43e1fe5d44097db8192b0a15b2fddb79 )