Update config to allow generate proper browser builds.

package.json

@@ -23,6 +23,8 @@
     "babel-plugin-transform-flow-strip-types": "6.4.0",
     "babel-preset-es2015": "6.3.13",
     "babel-register": "6.4.3",
+    "babelify": "7.3.0",
+    "browserify": "13.1.0",
     "flow-bin": "0.28.0",
     "reflex": "0.4.1",
     "tap": "1.1.0",
@@ -33,9 +35,9 @@
     "tape": "tape -r babel-register test/**/*.js",
     "flow": "flow check",
     "start": "babel --watch --out-dir ./lib ./src",
-    "build-node": "babel --out-dir ./lib ./src && cp ./src/*.flow ./lib",
-    "build-browser": "mkdir -p dist && babel --out-file ./dist/reflex-virtual-dom-driver.js --plugins 'transform-es2015-modules-umd' ./src",
-    "build": "npm run build-node && npm run build-browser",
+    "build:node": "babel --out-dir ./lib ./src && cp ./src/*.flow ./lib",
+    "build:browser": "browserify --require ./src/index:reflex-virtual-dom-driver --debug --transform babelify --outfile dist/reflex-virtual-dom-driver.js",
+    "build": "npm run build:node",
     "prepublish": "npm run build && npm run flow"
   },
   "repository": {