Make Nimbus run again on OS X

At least on OS X 10.9, I ran into two issues.

First, Twisted 10.0.0 doesn't compile anymore. Updated to 10.2.0 which
fixes it.

Second, Nimbus services wouldn't start anymore, complaining about the
lack of junixsocket library. Compiled and added a native junixsocket 1.4
JAR.