Add flow, example implementation and types

package.json

@@ -118,7 +118,7 @@
     "mobx-react-devtools": "^4.2.11",
     "moment": "2.13.0",
     "node-dev": "3.1.0",
-    "node-sass": "3.8.0",
+    "node-sass": "^4.5.2",
     "normalize.css": "4.1.1",
     "normalizr": "2.0.1",
     "pg": "^6.1.5",
@@ -157,6 +157,7 @@
     "babel-jest": "^15.0.0",
     "enzyme": "^2.4.1",
     "fetch-test-server": "^1.1.0",
+    "flow-bin": "^0.45.0",
     "identity-obj-proxy": "^3.0.0",
     "ignore-loader": "0.1.1",
     "jest-cli": "^15.1.1",