Ensure Java compiler targets Java 1.6 so ProGuard doesn't bork
Ensure Java compiler targets Java 1.6 so ProGuard doesn't bork

If you're running on Java 7, the compiler defaults to 1.7 and ProGuard
doesn't support Java 7 class files (support's coming with proguard 4.7) -
you get an error like this;

[proguard] Reading library jar [/var/lib/jenkins/tools/Auto_Java_6/jre/lib/rt.jar]
 [proguard] java.io.IOException: Can't read [proguard.ClassPathEntry@16e14f9] (Can't process class [com/oracle/net/Sdp$1.class] (Unsupported version number [51.0] for class format))
 [proguard] 	at proguard.InputReader.readInput(InputReader.java:230)
 [proguard] 	at proguard.InputReader.readInput(InputReader.java:200)
 [proguard] 	at proguard.InputReader.readInput(InputReader.java:178)
 [proguard] 	at proguard.InputReader.execute(InputReader.java:100)
 [proguard] 	at proguard.ProGuard.readInput(ProGuard.java:195)
 [proguard] 	at proguard.ProGuard.execute(ProGuard.java:78)
 [proguard] 	at proguard.ProGuard.main(ProGuard.java:499)

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