[BREAKING] New createNavigator API (#3392)

* New createNavigator and View API

See the RFC here:
https://github.com/react-navigation/rfcs/blob/master/text/0002-navigator-view-api.md

* shattered dreams of flow

* fix export

* Fix tab view issues found by brent

src/views/StackView/StackView.js

@@ -0,0 +1,66 @@
+import * as React from 'react';
+import { NativeModules } from 'react-native';
+
+import StackViewLayout from './StackViewLayout';
+import Transitioner from '../Transitioner';
+import NavigationActions from '../../NavigationActions';
+import TransitionConfigs from './StackViewTransitionConfigs';
+
+const NativeAnimatedModule =
+  NativeModules && NativeModules.NativeAnimatedModule;
+
+class StackView extends React.Component {
+  static defaultProps = {
+    navigationConfig: {
+      mode: 'card',
+    },
+  };
+
+  render() {
+    return (
+      <Transitioner
+        render={this._render}
+        configureTransition={this._configureTransition}
+        navigation={this.props.navigation}
+        descriptors={this.props.descriptors}
+        onTransitionStart={this.props.onTransitionStart}
+        onTransitionEnd={(lastTransition, transition) => {
+          const { onTransitionEnd, navigation } = this.props;
+          navigation.dispatch(
+            NavigationActions.completeTransition({
+              key: navigation.state.key,
+            })
+          );
+          onTransitionEnd && onTransitionEnd(lastTransition, transition);
+        }}
+      />
+    );
+  }
+
+  _configureTransition = (transitionProps, prevTransitionProps) => {
+    return {
+      ...TransitionConfigs.getTransitionConfig(
+        this.props.navigationConfig.transitionConfig,
+        transitionProps,
+        prevTransitionProps,
+        this.props.navigationConfig.mode === 'modal'
+      ).transitionSpec,
+      useNativeDriver: !!NativeAnimatedModule,
+    };
+  };
+
+  _render = (transitionProps, lastTransitionProps) => {
+    const { screenProps, navigationConfig } = this.props;
+    return (
+      <StackViewLayout
+        {...navigationConfig}
+        screenProps={screenProps}
+        descriptors={this.props.descriptors}
+        transitionProps={transitionProps}
+        lastTransitionProps={lastTransitionProps}
+      />
+    );
+  };
+}
+
+export default StackView;