Add NavigationPlayground Expo Demo (#1523)

* use react-navigation as dependency
* add expo based playground app
* name expo playground demo in the docs
* add ci task to deploy playground demo

examples/ExpoNavigationPlayground/.babelrc

@@ -0,0 +1,8 @@
+{
+  "presets": ["babel-preset-expo"],
+  "env": {
+    "development": {
+      "plugins": ["transform-react-jsx-source"]
+    }
+  }
+}

examples/ExpoNavigationPlayground/.gitignore

@@ -0,0 +1,3 @@
+node_modules/**/*
+.expo/*
+npm-debug.*

examples/ExpoNavigationPlayground/.watchmanconfig

@@ -0,0 +1 @@
+{}

examples/ExpoNavigationPlayground/exp.json

@@ -0,0 +1,24 @@
+{
+  "name": "NavigationPlayground",
+  "description": "Try out react-navigation now with this awesome playground",
+  "slug": "NavigationPlayground",
+  "privacy": "public",
+  "sdkVersion": "16.0.0",
+  "version": "1.0.0",
+  "orientation": "portrait",
+  "primaryColor": "#cccccc",
+  "icon": "./assets/icons/react-navigation.png",
+  "loading": {
+    "icon": "./assets/icons/react-navigation.png",
+    "hideExponentText": false
+  },
+  "packagerOpts": {
+    "assetExts": [
+      "ttf",
+      "mp4"
+    ]
+  },
+  "ios": {
+    "supportsTablet": true
+  }
+}

examples/ExpoNavigationPlayground/main.js

@@ -0,0 +1,4 @@
+import Expo from 'expo';
+import App from 'NavigationPlayground/js/App';
+
+Expo.registerRootComponent(App);

examples/ExpoNavigationPlayground/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "ExpoNavigationPlayground",
+  "version": "0.0.0",
+  "description": "Hello Expo!",
+  "author": null,
+  "private": true,
+  "main": "main.js",
+  "dependencies": {
+    "expo": "16.0.0",
+    "react": "16.0.0-alpha.6",
+    "react-native": "https://github.com/expo/react-native/archive/sdk-16.0.0.tar.gz",
+    "NavigationPlayground": "file:../NavigationPlayground"
+  }
+}

examples/NavigationPlayground/README.md

@@ -5,3 +5,5 @@ A playground for experimenting with react-navigation in a pure-JS React Native a
 ## Usage
 
 Please see the [Contributors Guide](https://github.com/react-community/react-navigation/blob/master/docs/guides/Contributors.md#development) for instructions on running these example apps.
+
+You can view this example application directly on your phone by visiting [our expo demo](https://exp.host/@react-navigation/NavigationPlayground).

examples/NavigationPlayground/package.json

@@ -8,12 +8,12 @@
   "dependencies": {
     "react": "16.0.0-alpha.6",
     "react-native": "^0.44.0",
-    "react-native-vector-icons": "^4.1.1"
+    "react-native-vector-icons": "^4.1.1",
+    "react-navigation": "file:../.."
   },
   "devDependencies": {
     "babel-jest": "^20.0.1",
     "jest": "^20.0.1",
-    "react-navigation": "file:../..",
     "react-test-renderer": "^15.5.4"
   },
   "jest": {