Add Java version as info log

[bdw429s]

I find myself looking at console logs of people's servers a lot and I often times wonder exactly what version of Java they used to start their server. Can we add a line of info logging around here that simply outputs the version of Java in use to start the server:

[INFO ] Runwar: Starting RunWAR 3.8.1-SNAPSHOT
[DEBUG] Runwar: Checking that we're running on > java7

[denuno]

Already changed in version 4 (since to have older CF versions work you have to swap out the java.version property), now it outputs both what is required and what is detected (at least via the java.version system property).