Updatd yeoman-generator and mocha dependencies
Fixed 'Cannot read property 'bold' of undefined' error using chalk instead of colors, per https://github.com/yeoman/generator-webapp/issues/137 and https://github.com/yeoman/generator/commit/3c60110
beforeEach in creation spec was failing due not finding the generator in Yeoman's list. This looks for the correct name now. I'm assuming that Yeoman names are created differently now versus when these specs were last run?
Inquirer.js' prompt method was throwing errors and causing test failures. I couldn't track down a commit in the Inquirer.js repo where this behavior has changed, but I took a hint from https://github.com/yeoman/generator-webapp/blob/master/app/index.js#L64 which expects the first argument to be responses