Changed from using grunt-contrib-sass to grunt-dart-sass so that building the SASS stylesheets don't rely on having a system installation of ruby and sass

Gruntfile.js

@@ -4,7 +4,7 @@ module.exports = function(grunt) {
 
   // Project configuration.
   grunt.initConfig({
-    sass: {
+    'dart-sass': {
       dist: {
         options: {
           style: 'compressed'
@@ -69,7 +69,7 @@ module.exports = function(grunt) {
       },
       css: {
         files: ['assets/sass/*.sass'],
-        tasks: ['sass'],
+        tasks: ['dart-sass'],
         options: {
           atBegin: true,
           spawn: false
@@ -96,12 +96,12 @@ module.exports = function(grunt) {
 
   // Load task plugins
   grunt.loadNpmTasks('grunt-twig-render');
-  grunt.loadNpmTasks('grunt-contrib-sass');
+  grunt.loadNpmTasks('grunt-dart-sass');
   grunt.loadNpmTasks('grunt-contrib-coffee');
   grunt.loadNpmTasks('grunt-contrib-copy');
   grunt.loadNpmTasks('grunt-contrib-watch');
 
   // Default task(s).
-  grunt.registerTask('default', ['twigRender', 'sass', 'coffee', 'copy']);
+  grunt.registerTask('default', ['twigRender', 'dart-sass', 'coffee', 'copy']);
 
 };

package.json

@@ -25,8 +25,8 @@
     "grunt": "^1.5.3",
     "grunt-contrib-coffee": "^2.1.0",
     "grunt-contrib-copy": "^1.0.0",
-    "grunt-contrib-sass": "^2.0.0",
     "grunt-contrib-watch": "^1.1.0",
+    "grunt-dart-sass": "^2.0.1",
     "grunt-twig-render": "^1.8.3"
   },
   "dependencies": {