Fix for leiningen build system file

Hi,

I'm very new to Sublime, but the leiningen build system wasn't working for me - I needed to change the 'working_dir' setting from $file to $project_path. I'm using Sublime 2.0.1 . I fully admit there may be some other reason this was not working for me since I am a newbie as I said!

Also I needed to add a path setting to get this to work for me, so my patch includes a commented out way to show how to do this.

Thanks

Mike