fix(config): allow CoffeeScript 1.7 to be used

CoffeeScript 1.7 requires a register call to be made. This change is still backwards compatible with older versions of CS because the needed part, the require, is still done. The register function fails but it is wrapped in a try catch block so it fails silently.
Merge pull request #903 from eddiemonge/patch-1

fix(config): allow CoffeeScript 1.7 to be used