updated .travis.yml as travis doesn't support node 0.4 or 0.9
updated .travis.yml as travis doesn't support node 0.4 or 0.9

NickHeiner/nconf,philip1986/nconf,olalonde/nconf,imjerrybao/nconf,remy/nconf,HansHammel/nconf,Dependencies/nconf,ChristianMurphy/nconf,bryce-gibson/nconf,indexzero/nconf