Move react and react-dom to peer dependency

Author: Brandon Dail

package.json

@@ -47,7 +47,7 @@
     "webpack": "^1.13.2",
     "webpack-dev-server": "^1.16.1"
   },
-  "dependencies": {
+  "peerDependencies": {
     "react": "^15.3.2",
     "react-dom": "^15.3.2"
   }