chore: do not ignore rollup config

.gitignore

@@ -14,4 +14,5 @@
 /typings
 
 !gulpfile.js
-/.idea
+/.idea
+!rollup.config.js

rollup.config.js

@@ -0,0 +1,26 @@
+import path from 'path';
+import { readFileSync } from 'fs';
+import node from 'rollup-plugin-node-resolve';
+import buble from 'rollup-plugin-buble';
+
+let pkg = JSON.parse(readFileSync(path.resolve(__dirname, 'package.json')));
+
+export default {
+  entry: 'ngx-uploader.js',
+  dest: 'bundle/ngx-uploader.umd.js',
+  format: 'umd',
+  moduleName: 'ngx-uploader',
+  context: 'this',
+  plugins: [ node(), buble() ],
+  external: Object.keys(pkg.devDependencies),
+  globals: {
+    '@angular/core': 'vendor._angular_core',
+    '@angular/common': 'vendor._angular_common',
+    '@angular/platform-browser': 'vendor._angular_platformBrowser',
+    '@angular/platform-browser-dynamic': 'vendor._angular_platformBrowserDynamic',
+    '@angular/router': 'vendor._angular_router',
+    '@angular/http': 'vendor._angular_http',
+    '@angular/forms': 'vendor._angular_forms',
+    'rxjs': 'vendor.rxjs'
+  }
+}