Update React to 15.2.0-rc.1

Summary:
Notable changes (excluding DOM-only things):

- Improved warning messages for propTypes and key warnings
- Production error codes
- Improved performance in DEV mode
- More accurate data in ReactPerf instrumentation
- Experimental JSON test renderer
- Minor bug fixes

Full changelog: fef495942a...c66f40f749.

Reviewed By: AaaChiuuu

Differential Revision: D3442002

fbshipit-source-id: 940fc65ba5d0b742417bbe2fcbd36eb9dc7443e1

Libraries/Inspector/Inspector.js

@@ -129,7 +129,7 @@ class Inspector extends React.Component {
     // therefore we use the internal _instance property directly.
     var publicInstance = instance['_instance'] || {};
     var source = instance['_currentElement'] && instance['_currentElement']['_source'];
-    UIManager.measure(instance.getNativeNode(), (x, y, width, height, left, top) => {
+    UIManager.measure(instance.getHostNode(), (x, y, width, height, left, top) => {
       this.setState({
         inspected: {
           frame: {left, top, width, height},

package.json

@@ -125,7 +125,7 @@
     "react-native": "local-cli/wrong-react-native.js"
   },
   "peerDependencies": {
-    "react": "~15.1.0"
+    "react": "~15.2.0-rc.1"
   },
   "dependencies": {
     "absolute-path": "^0.0.0",
@@ -201,7 +201,7 @@
     "flow-bin": "^0.27.0",
     "jest": "12.1.1",
     "portfinder": "0.4.0",
-    "react": "~15.1.0",
+    "react": "~15.2.0-rc.1",
     "shelljs": "0.6.0"
   }
 }