Start down path of adding better error msg for apps updating to sails…

…-hook-grunt@4 (but will revert because theres no obvious clean way of doing this that doesnt make it harder to continue using JST/coffee yourself)

accessible/load-grunt-tasks.js

@@ -30,6 +30,13 @@ var includeAll = require('include-all');
  */
 module.exports = function loadGruntTasks (appPath, grunt){
 
+  // Verify that reviously-built-in-but-no-longer-included-by-default Grunt plugins:
+  // ========================================================
+  var NO_LONGER_BUILT_IN_GRUNT_PLUGINS = [
+    'grunt-contrib-jst',
+    'grunt-contrib-coffee'
+  ];
+
 
   // Load built-in Grunt plugins.
   // ========================================================