Switch to new jscs-preset-gulp config

Created by: pdehaan

$ npm run lint

> gulp@3.9.0 lint /Users/pdehaan/dev/github/gulp
> jshint lib bin test index.js --reporter node_modules/jshint-stylish/stylish.js --exclude node_modules && jscs lib bin test index.js


✔ No problems

$ echo $?
0

Without setting requireCapitalizedComments to null, I get 22 code style errors from JSCS.

If we don't care about capitalized code comments, we can override the rule in the global jscs-preset-gulp module. If we do care about capitalized comments, we'll need to fix the 22 errors in this repo and then delete the JSCS rule in a future PR.