Bump coffee-script dependency to 1.0.1

I'm getting some Bundler issues trying to use the github-pages gem and jemoji:

```
Bundler could not find compatible versions for gem "jekyll-coffeescript":
  In Gemfile:
    github-pages (>= 0) ruby depends on
      jekyll-coffeescript (= 1.0.0) ruby

    jemoji (= 0.3.0) ruby depends on
      jekyll (~> 2.0) ruby depends on
        jekyll-coffeescript (1.0.1)

Bundler could not find compatible versions for gem "jekyll":
  In Gemfile:
    github-pages (>= 0) ruby depends on
      jekyll (= 1.1.2) ruby

    jemoji (= 0.3.0) ruby depends on
      jekyll (2.4.0)
```

I believe this'll resolve that? /cc @benbalter @parkr