Allows Atom to recognize CWL as a language.
Really, I just copied the Atom core YAML grammar files and then tweaked them to work with CWL-specific syntax.
Currently, the way to use this atom package is to clone this repo and then use apm link to link it into your atom package directory.
You will also probably want to install https://github.com/SolomonShorser-OICR/cwl-solarized-dark as this is a syntax theme that has CWL-specific highlighting.