Attempt to cleanup the pom.xml for now.

Also added a small entry to the .gitignore file.

I see that you are trying to get synced with the upstream Spoutcraft project. So did won't merge with the `dev` branch.

But I wanted to share my hard work over the couple of days :P Just use it as reference. I'm able to compile the OS X version now. And it runs just fine. Maybe I will take a look at the Windows version if desired.