Nashorn

Sahi is now running with the Nashorn engine, which requires Java 8. This should allow EMCAScript 5.1. features to be used in test scripts.
Added Log4j, the configuration is read every minute from the log4j.properties which allows changes at runtime.
Proxy now deletes the content-security-policy header which interfered with testing facebook pages. Domainfix for Facebook added.
We removed some references and files regarding windows, ssl and rhino.