revert the hack for build since the logic is in 7.2.0

Author: stevemao

package.json

@@ -30,11 +30,12 @@
     "react-addons-test-utils": "^0.14.3",
     "react-dom": "^0.14.3",
     "skatejs": "^0.14.3",
-    "skatejs-build": "^4.2.3",
+    "skatejs-build": "^7.2.0",
     "webcomponents.js": "0.7.22"
   },
   "peerDependencies": {
-    "react": ">=0.14.0"
+    "react": ">=0.14.0",
+    "react-dom": ">=0.14.0"
   },
   "config": {
     "commitizen": {

rollup.config.js

@@ -1,13 +1 @@
-const config = require('skatejs-build/rollup.config');
-const pkg = require('skatejs-build/package');
-
-const deps = Object.keys(pkg.dependencies || []);
-config.external = id => {
-  if (id === 'react' || id === 'react-dom') {
-    return true;
-  }
-
-  return deps.indexOf(id) > -1
-}
-
-module.exports = config;
+module.exports = require('skatejs-build/rollup.config');