process YAML header first

[pearsonca]

I'd like to be able to make use of the YAML header / liquid template processing in out-of-the-box Jekyll for .less files. i.e.:

---

---

.{{ someTargetNameFromConfig }} {
  /* ... */
} 

so I can only have to specify those classes (e.g.) in one place to use them across the pages / css / js.

As it stands, the assets aren't initially checked for any YAML / liquid processing before they are then run through the (e.g.) Less compiler.