fix coffee-script require error

Calling `require("coffee-script")` fails with the error "Error: Use CoffeeScript.register() or require the coffee-script/register module to require .coffee.md files.".  The coffee-script compiler must be registered as of version 1.7.0 using `require("coffee-script/register")` or `CoffeeScript.Register` - see [this issue](https://github.com/jashkenas/coffeescript/issues/3349).

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