initial app router and some views

src/js/native_react_views/NavButton.js

@@ -0,0 +1,32 @@
+var React = require('react-native');
+var {
+  PixelRatio,
+  StyleSheet,
+  Text,
+  TouchableHighlight,
+  View,
+} = React;
+
+class NavButton extends React.Component {
+  render() {
+    return (
+      <TouchableHighlight
+        style={styles.button}
+        underlayColor="#B5B5B5"
+        onPress={this.props.onPress}>
+        <Text style={styles.buttonText}>{this.props.text}</Text>
+      </TouchableHighlight>
+    );
+  }
+}
+
+var styles = StyleSheet.create({
+  button: {
+    backgroundColor: 'white',
+    padding: 15,
+    borderBottomWidth: 1 / PixelRatio.get(),
+    borderBottomColor: '#CDCDCD',
+  },
+});
+
+module.exports = NavButton;