updated travis builds to use latest node.js LTS version (4.2.1) & latest stable version
updated travis builds to use latest node.js LTS version (4.2.1) & latest stable version

WrathOfZombies/generator-office,OfficeDev/generator-office,jasonjoh/generator-office,WrathOfZombies/generator-office,waldekmastykarz/generator-office,jasonjoh/generator-office,andrewconnell/generator-office,waldekmastykarz/generator-office,jasonjoh/generator-office,andrewconnell/generator-office,WrathOfZombies/generator-office