Fix for issue #903: 0.8.2 with JDK8

As Gephi 0.8.2 is still based on Netbeans 7.2.1 which suffers from [netbeans issue 229191](https://netbeans.org/bugzilla/show_bug.cgi?id=229191), which is solved since NB7.3.1. This fix upgrades to NB7.4.