remove webpack comments from build (for yuidoc) (processing#377)

The comments in p5.sound.js are used to generate documentation in the p5.js repo as part of that project's yuidoc config.

This removes the comments that webpack adds because they were confusing the YUIDoc parser. It also adds the version number and date to the top of both p5.sound.js and p5.sound.min.js

Gruntfile.js

@@ -4,7 +4,22 @@ module.exports = function(grunt) {
 
   grunt.initConfig({
     pkg: grunt.file.readJSON('package.json'),
-
+    decomment: {
+      any: {
+        // remove comments added by webpack from the build
+        files: {
+            "./lib/p5.sound.js": "./lib/p5.sound.js",
+        },
+        options: {
+          ignore: [
+            // keep JSDoc comments (p5.js repo's YUIDoc task parses those for documentation)
+            /\/\*\*\s*\n([^\*]|(\*(?!\/)))*\*\//g,
+            // keep the version number
+            /.*Version.*/
+          ]
+        }
+      }
+    },
     // Configure style consistency
     eslint: {
       source: {
@@ -46,9 +61,10 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-eslint');
   grunt.loadNpmTasks('grunt-contrib-connect');
   grunt.loadNpmTasks('grunt-open');
+  grunt.loadNpmTasks('grunt-decomment');
 
   grunt.registerTask('lint', ['eslint:source']);
-  grunt.registerTask('default', ['webpack:prod']);
+  grunt.registerTask('default', ['webpack:prod', 'decomment']);
   grunt.registerTask('dev', ['connect','webpack:dev']);
   grunt.registerTask('serve', 'connect:server:keepalive');
   grunt.registerTask('run-tests', ['serve', 'open']);