Add Object Spread Support to Our Babel Config

Won't really use this in prod code yet but I have a benchmark that
uses it.

.babelrc

@@ -4,6 +4,7 @@
   "plugins": [
     "fbjs-scripts/babel-6/dev-expression",
     "syntax-trailing-function-commas",
+    "babel-plugin-transform-object-rest-spread",
     "transform-es2015-template-literals",
     "transform-es2015-literals",
     "transform-es2015-arrow-functions",

package.json

@@ -25,6 +25,7 @@
     "babel-plugin-transform-es2015-template-literals": "^6.5.2",
     "babel-plugin-transform-es3-member-expression-literals": "^6.5.0",
     "babel-plugin-transform-es3-property-literals": "^6.5.0",
+    "babel-plugin-transform-object-rest-spread": "^6.6.5",
     "babel-preset-react": "^6.5.0",
     "browserify": "^13.0.0",
     "bundle-collapser": "^1.1.1",