Adds UMD wrapper to provide support for build via browserify, commonjs, and amd.

Fixes namespace pollution (reqwest, and a number of variables generated by AMDClean used to be added to window)
To work around a bug in AMDClean, minification is now handled via a separate uglify grunt task.

Author: brysonian

Gruntfile.js

@@ -69,8 +69,12 @@ module.exports = function(grunt) {
           findNestedDependencies: true,
           include: ['src/app'],
           onBuildWrite: function( name, path, contents ) {
+            if (name === 'reqwest') {
+              contents = contents.replace('}(\'reqwest\', this, function () {', '}(\'reqwest\', amdclean, function () {');
+            }
             return require('amdclean').clean({
               code: contents,
+              'globalObject': true,
               escodegen: {
                 'comment': true,
                 'format': {
@@ -137,26 +141,17 @@ module.exports = function(grunt) {
           },
           useStrict: true,
           wrap: {
-            start: '/*! p5.js v<%= pkg.version %> <%= grunt.template.today("mmmm dd, yyyy") %> */\n',
-            end: ''
-          }
-        }
-      },
-      min: {
-        options: {
-          baseUrl: '.',
-          findNestedDependencies: true,
-          include: ['src/app'],
-          onBuildWrite: function( name, path, contents ) {
-            return require('amdclean').clean(contents);
-          },
-          optimize: 'uglify2',
-          out: 'lib/p5.min.js',
-          paths: '<%= requirejs.unmin.options.paths %>',
-          useStrict: true,
-          wrap: {
-            start: '/*! p5.min.js v<%= pkg.version %> <%= grunt.template.today("mmmm dd, yyyy") %> */\n',
-            end: ''
+            start:
+              ['/*! p5.js v<%= pkg.version %> <%= grunt.template.today("mmmm dd, yyyy") %> */',
+              '(function (root, factory) {',
+              '  if (typeof define === \'function\' && define.amd)',
+              '    define(\'p5\', [], function () { return (root.returnExportsGlobal = factory());});',
+              '  else if (typeof exports === \'object\')',
+              '    module.exports = factory();',
+              '  else',
+              '    root[\'p5\'] = factory();',
+              '}(this, function () {\n'].join('\n'),
+            end: 'return amdclean[\'src_app\'];\n}));'
           }
         }
       },
@@ -174,6 +169,15 @@ module.exports = function(grunt) {
         }
       }
     },
+    uglify: {
+      options: {
+        banner: '/*! p5.js v<%= pkg.version %> <%= grunt.template.today("mmmm dd, yyyy") %> */'
+      },
+      build: {
+        src: '<%= requirejs.unmin.options.out %>',
+        dest: 'lib/p5.min.js'
+      }
+    },
     yuidoc: {
       compile: {
         name: '<%= pkg.name %>',
@@ -208,8 +212,9 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-contrib-sass');
   grunt.loadNpmTasks('grunt-release');
   grunt.loadNpmTasks('grunt-update-json');
+  grunt.loadNpmTasks('grunt-contrib-uglify');
   grunt.registerTask('test', ['jshint', 'mocha']);
   grunt.registerTask('yui', ['yuidoc']);
-  grunt.registerTask('default', ['jshint', 'requirejs', 'mocha']);
+  grunt.registerTask('default', ['jshint', 'requirejs', 'mocha', 'uglify']);
 
 };