Build: add new build script

fix #16
fix #21
fix #22

build.js

@@ -0,0 +1,27 @@
+var mkdirp = require("mkdirp");
+var esperanto = require("esperanto");
+var fs = require("fs");
+var babel = require("babel");
+var pkg = require("./package.json");
+
+mkdirp.sync("dist");
+
+esperanto.bundle({
+    base: "lib",
+    entry: "index.js"
+}).then(function (bundle) {
+    var umd = bundle.toUmd({
+        name: "JsReporters"
+    });
+
+    var transformed = babel.transform(umd.code, {
+        blacklist: [
+            "useStrict"
+        ]
+    });
+    var license = fs.readFileSync("lib/license-header.js", {encoding: "utf8"})
+        .replace("@VERSION", pkg.version)
+        .replace("@DATE", ( new Date() ).toISOString().replace(/:\d+\.\d+Z$/, "Z"));
+    var content = license + "(function() {\n" + transformed.code + "\n})();";
+    fs.writeFileSync("dist/js-reporters.js", content);
+}).catch(console.error);

lib/license-header.js

@@ -0,0 +1,10 @@
+/*!
+ * JS Reporters @VERSION
+ * https://github.com/js-reporters
+ *
+ * Copyright jQuery Foundation and other contributors
+ * Released under the MIT license
+ * http://jquery.org/license
+ *
+ * Date: @DATE
+ */

package.json

@@ -2,7 +2,7 @@
   "name": "js-reporters",
   "version": "1.0.0",
   "scripts": {
-    "build": "mkdirp dist/ && esperanto -b -i lib/index.js -t umd --name JsReporters | babel -o dist/js-reporters.js --blacklist strict -m umd",
+    "build": "node build.js",
     "lint": "eslint lib/ test/",
     "test": "node test/test.js"
   },