here we go

.editorconfig

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+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+node_modules

bower.json

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+{
+  "name": "customevent-polyfill",
+  "version": "1.0.0",
+  "homepage": "https://github.com/kaesetoast/customevent-polyfill",
+  "authors": [
+    "Philipp Nowinski <[email protected]>"
+  ],
+  "description": "A polyfill for CustomEvent",
+  "main": "customevent-polyfill.js",
+  "keywords": [
+    "polyfill",
+    "customevent"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "app/bower_components",
+    "test",
+    "tests"
+  ]
+}

customevent-polyfill.js

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+(function () {
+    'use strict';
+    function CustomEvent (event, params) {
+        params = params || { bubbles: false, cancelable: false, detail: undefined };
+        var evt;
+        try {
+            evt = document.createEvent('CustomEvent');
+            evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
+        } catch (error) {
+            // fallback for browsers that don't support createEvent('CustomEvent')
+            evt = document.createEvent('Event');
+            for (var param in params) {
+                evt[param] = params[param];
+            }
+            evt.initEvent(event, params.bubbles, params.cancelable);
+        }
+        return evt;
+    }
+
+    if(typeof window.CustomEvent !== 'undefined') {
+        CustomEvent.prototype = window.CustomEvent.prototype;
+    }
+
+    window.CustomEvent = CustomEvent;
+})();

gulpfile.js

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+'use strict';
+
+var gulp = require('gulp'),
+    uglify = require('gulp-uglify'),
+    rename = require('gulp-rename');
+
+gulp.task('compress', function() {
+    gulp.src('customevent-polyfill.js')
+    .pipe(uglify())
+    .pipe(rename('customevent-polyfill.min.js'))
+    .pipe(gulp.dest('.'));
+});

package.json

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+{
+  "name": "customevent-polyfill",
+  "version": "1.0.0",
+  "description": "A polyfill for CustomEvent",
+  "main": "customevent-polyfill.js",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/kaesetoast/customevent-polyfill.git"
+  },
+  "author": "Philipp Nowinski <[email protected]",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/kaesetoast/customevent-polyfill/issues"
+  },
+  "homepage": "https://github.com/kaesetoast/customevent-polyfill",
+  "devDependencies": {
+    "gulp": "^3.6.2",
+    "gulp-rename": "^1.2.0",
+    "gulp-uglify": "^0.3.0"
+  }
+}