Added possibility to test local from a vm image.

In order to test IE10+ we use modern.ie with virtual box. This means
The wayf url can not be localhost since that will point to virtual box
and the app is running on our host machine. To test it from a vm
(or any other machine for that matter) you need to start jetty
with the following commandline system proerty:

mvn jetty:run -Djetty.host=YOUR_IP_ADDRESS_HERE

Then from your vm open IE and browse to: http://YOUR_IP_ADDRESS_HERE:8001.