Fix/simplify path.resolve issue on 0.10 & 0.8

Mocha already calls path.resolve (https://github.com/visionmedia/mocha/blob/master/lib/mocha.js#L150). The attached is tested on 0.8.22 and 0.10.0.
Merge pull request #28 from bharrisau/patch-2

Fix/simplify path.resolve issue on 0.10 & 0.8