Adding support for options and _common fallback

If a script is not in a specific filetype directory, look in the
_common directory.

When running the script, load the lengthy variable like
$PRETTY_JS_JSLINT_OPTIONS into the simpler $OPTIONS variable.
Switching to $OPTIONS
Moved two scripts to _common
Adding SASS/SCSS/JSON

It's good to be thorough.  Let's support more formats!