Update React Native version to latest

Pick the latest version of React Native compatible with the external libraries we use.
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Upgraded to RN 0.47.2.
RN 0.48.0 was just released at his time but not stable enough...
Updated most of the RN external libraries.

Upgrade Process

Followed https://facebook.github.io/react-native/docs/upgrading.html
react-native-git-upgrade didn't work (git diff was done but couldn't be applied) so used the alternative with react-native upgrade.

Main breaking changes

• 0.44: iOS: Support withCredentials flag in XHRs
• 0.43: Android: Only call onLayout when layout has actually changed
• 0.41: Android - ReactNativeHost getUseDeveloperSupport to public
• 0.40: Namespace all header imports to <React/...>
• 0.39: Move to new C-based implementation of css-layout on Android
• 0.39: Fix inconsistency with fractional TextInput padding

Updated RN libraries

-    "bugsnag-react-native": "1.2.3",
+    "bugsnag-react-native": "2.3.2",
     "extend": "3.0.0",
     "jssha": "^2.3.1",
     "moment": "2.17.0",
     "nuxeo": "^3.2.1",
     "query-string": "^4.3.4",
     "random-js": "^1.0.8",
-    "react": "15.4.1",
-    "react-native": "0.38.0",
-    "react-native-cookies": "2.0.0",
+    "react": "16.0.0-alpha.12",
+    "react-native": "0.47.2",
+    "react-native-cookies": "3.2.0",
     "react-native-custom-tabs": "0.1.6",
-    "react-native-device-info": "0.9.6",
-    "react-native-drawer": "2.3.0",
-    "react-native-fetch-blob": "0.10.0",
-    "react-native-i18n": "0.1.1",
-    "react-native-photo-view": "1.2.0",
-    "react-native-router-flux": "3.37.0",
+    "react-native-device-info": "0.11.0",
+    "react-native-drawer": "2.5.0",
+    "react-native-fetch-blob": "0.10.8",
+    "react-native-i18n": "2.0.5",
+    "react-native-photo-view": "1.4.0",
+    "react-native-router-flux": "3.41.0",
     "react-native-safari-view": "2.0.0",
-    "react-native-segment-analytics": "0.1.9",
-    "react-native-share": "1.0.17",
+    "react-native-segment-analytics": "git+https://github.com/chitezh/react-native-segment-analytics#88d764270b8c221b0dd483ef9e3c71d5fe4cf056",
+    "react-native-share": "1.0.21",

Notes:

• react-native-showdown: seems dead so we should study an alterative, see NXMOB-296
• react-native-swipeout: still relying on a patched fork, let's try to align on the main repository or study an alternative, see NXMOB-387
• react-native-router-flux: updated to the latest version of the v3 branch, see NXMOB-385 for upgrading to v4 and about the npm shrinkwrap hack
• react-native-segment-analytics: now relying on a patched fork, let's try to align on the main repository, see NXMOB-388
• react-native-fetch-blob: we now get an non blocking error when downloading a file from Android, see NXMOB-390
• devDependencies: didn't update any lib, about this see NXMOB-389

Build

Had some Xcode compilation issues depending on the way of linking some RN libraries.

• Sometimes react-native link worked (now need to use node_modules/react-native/local-cli/cli.js link instead of the deprecated rnpm link).
• Sometimes needed to not use react-native link but rely on Cocoapods only as for react-native-i18n.
  => running react-native link globally will add some libRNI18n.a entries in project.pbxproj that mustn't be committed as they would interfere with the pod installation and make the compilation fail.
• Sometimes needed to link manually in Xcode.

After aligning on master here's the process:

gem install fastlane -NV
gem install cocoapods

rm -rf node_modules
npm cache clean --force
npm install
npm prune
pod repo update
cd ios
rm -rf Pods
pod install
# make sure it compiles
fastlane gym --scheme NuxeoMobile --export_method app-store --workspace './ios/NuxeoMobile.xcworkspace'
npm start -- --reset-cache
npm run ios