Eclipse Compiler Update for Java8 support

./go does not work using JDK8 since the Eclipse compiler contains a bug. (See https://bugs.eclipse.org/bugs/show_bug.cgi?id=396000, https://github.com/processing/processing/issues/2260)
Building on JDK7 works fine.

This patch contains a newer Eclipse compiler, which contains the bugfix for JDK8.

Tested on Mac OSX 10.9.2 with JDK8u5