MacOSX build settings (64-bit) and instructions

Hello,

After a few makefile settings I was able to build LightZone on MacOSX 10.5.8 with Java 1.6.  I also wrote up how to do the build with Ant or Eclipse.  This is basic LightZone, not the OSX-specific wrapper yet.

I found out about LightZone through the LWN article last week.  Very cool project!  I haven't been able to access the Dev forum yet on Google Groups, so I apologize if I'm not sending this pull request the way you'd like it.

Thanks for taking a look,
-Jeremy Monin

![lightzone-osx-browser-20130203](https://f.cloud.github.com/assets/2141472/122015/ea0f9978-6e1f-11e2-8c29-bf92ca49dda4.png)

![lightzone-osx-editor-20130203](https://f.cloud.github.com/assets/2141472/122016/f4a3396c-6e1f-11e2-95ca-a8f984b18462.png)