Update app.js

I wanted to try out your app, but I can't get it to run. I keep getting this error:

Error: require.paths is removed. Use node_modules folders, or the NODE_PATH environment variable instead.
    at Function.Object.defineProperty.get (module.js:388:11)
    at Object.<anonymous> (/opt/Gitolite-Manager/app.js:15:8)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:901:3

It looks like this line (15) is causing the issue:
    require.paths.push('/usr/local/lib/node_modules');

I would try and fix it, but I just recently found out about Node, so I don't know what I am doing.

BTW, I have Node v0.10.15 on Ubuntu 12.10 x64, installed via the instructions from the website