make sure grunt knows to compile literate coffeescript too
make sure grunt knows to compile literate coffeescript too

This adds `.litcoffee` and `.coffee.md` extensions to the
search paths for CoffeeScript files.

narainsagar/generator-webapp-php,snatera15/generator-webapp-material,snatera15/generator-webapp-material,narainsagar/generator-webapp-php,narainsagar/generator-webapp-php,amercier/generator-webapp-php,amercier/generator-webapp-php,amercier/generator-webapp-php