remove vue.common.js (just use umd build)

Author: yyx990803

build/build.js

@@ -19,46 +19,27 @@ var main = fs
   .replace(/Vue\.version = '[\d\.]+'/, "Vue.version = '" + version + "'")
 fs.writeFileSync('src/index.js', main)
 
-// CommonJS build.
-// this is used as the "main" field in package.json
-// and used by bundlers like Webpack and Browserify.
+// Dev build
 rollup.rollup({
   entry: 'src/index.js',
   plugins: [
+    replace({
+      'process.env.NODE_ENV': "'development'"
+    }),
     babel({
       loose: 'all'
     })
   ]
 })
 .then(function (bundle) {
-  return write('dist/vue.common.js', bundle.generate({
-    format: 'cjs',
-    banner: banner
+  return write('dist/vue.js', bundle.generate({
+    format: 'umd',
+    banner: banner,
+    moduleName: 'Vue'
   }).code)
 })
-// Standalone Dev Build
 .then(function () {
-  return rollup.rollup({
-    entry: 'src/index.js',
-    plugins: [
-      replace({
-        'process.env.NODE_ENV': "'development'"
-      }),
-      babel({
-        loose: 'all'
-      })
-    ]
-  })
-  .then(function (bundle) {
-    return write('dist/vue.js', bundle.generate({
-      format: 'umd',
-      banner: banner,
-      moduleName: 'Vue'
-    }).code)
-  })
-})
-.then(function () {
-  // Standalone Production Build
+  // Production build
   return rollup.rollup({
     entry: 'src/index.js',
     plugins: [