Update dependencies

[evanmwillhite]

From this original PR - I may continue to work on that other branch to resolve remaining issues, but need to get this in.

Companion PR in Emulsify (merge at same time)

This PR resolves #79.

Pull Request Deployment

If you've never set up Emulsify Gulp for local testing, do the following:

• Step 1: Clone this branch of Emulsify Gulp locally and run npm link
• Step 2: Go to your Emulsify installation and run npm link emulsify-gulp

To Test:

• Install a fresh copy of Emulsify
• Run npm run start and see that Pattern Lab is served up
• Stress test parts of Emulsify Gulp that use this list of updated dependencies:

babel-preset-minify          0.2.0   0.2.0   0.5.0  emulsify-gulp
eslint                      4.19.1  4.19.1   5.9.0  emulsify-gulp
eslint-config-airbnb-base   11.3.2  11.3.2  13.1.0  emulsify-gulp
gh-pages                     1.2.0   1.2.0   2.0.1  emulsify-gulp
gulp-autoprefixer            4.1.0   4.1.0   6.0.0  emulsify-gulp
gulp-babel                   7.0.1   7.0.1   8.0.0  emulsify-gulp
gulp-clean-css              3.10.0  3.10.0   4.0.0  emulsify-gulp
gulp-flatten                 0.3.1   0.3.1   0.4.0  emulsify-gulp
gulp-imagemin                3.4.0   3.4.0   5.0.3  emulsify-gulp
gulp-sass                    3.2.1   3.2.1   4.0.2  emulsify-gulp
gulp-stylelint               4.0.0   4.0.0   8.0.0  emulsify-gulp
ngrok                        2.3.0   2.3.0   3.1.0  emulsify-gulp
node-normalize-scss          3.0.0   3.0.0   8.0.0  emulsify-gulp
stylelint                    8.4.0   8.4.0   9.8.0  emulsify-gulp
stylelint-config-standard   17.0.0  17.0.0  18.2.0  emulsify-gulp```

[mikeethedude]

After testing this for a bit I'm not seeing any issues. Dependencies seem to be working well. Gulp tasks are working as expected.