Updated packages and Gradle configuration

* Updated packages:
  * react: ^16.3.2 (was ^16.3.0-alpha.1)
  * react-native: ^0.54.4 (was ^0.54.4)
  * native-base: "^2.4.4 (was ^2.4.2)
  * redux: ^4.0.0 (was ^3.7.2)
  * react-test-renderer: ^16.3.2 (was 16.3.0-alpha.3)
  * NOTE: I read the update notes and these should be safe changes,
    including "redux", which got a major version update.

* Gradle-related changes:
  * Changed the way how the SDK is defined in the Gradle configuration:
    Now this is configured globally in `/android/build.gradle`, which
    gets rid of the version warnings.
  * Updated Gradle to version 4.4 (was 4.1).
  * Updated the Gradle plugin to version 3.1 (was 3.0.1).

INSTALLATION STEPS:
===================
rm package-lock.json
rm node_modules
npm install --no-optional  // (NOTE: "--no-optional" needed on Windows)

TROUBLESHOOTING:
================
* If there are any errors like "could not delete folder x", remove those
  folders manually, e.g.:
    rm C:\r3\android\app\build\intermediates\incremental\processDebugResources
    rm C:\r3\android\app\build\generated\source\r\debug\org\webkit

* If there are errors like "unable to create folder x", try again. It
  should work on the second time.

READ
====
* Main motivation:
  * We should have an SDK version which is at least v26, since that will
    be the minimum to be accepted in the Play store after August 2018:
      facebook/react-native#17287
      facebook/react-native#19297
  * Regarding Gradle, the latest versions are required to build for the
    lastest SDKs, but will also increase compilation time a lot:
      facebook/react-native#15448

* React Native Maps installation and Gradle upgrade instructions:
    https://itnext.io/install-react-native-maps-with-gradle-3-on-android-44f91a70a395

* Migration instructions for the Android Gradle Plugin v3.0.0:
    https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration

* List of versions of the Android Gradle Plugin and upgrade steps:
    https://developer.android.com/studio/releases/gradle-plugin

android/app/build.gradle

@@ -100,8 +100,8 @@ def enableSeparateBuildPerCPUArchitecture = false
 def enableProguardInReleaseBuilds = false
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion "26.0.2"
+    compileSdkVersion rootProject.ext.compileSdkVersion
+    buildToolsVersion rootProject.ext.buildToolsVersion
 
     defaultConfig {
         applicationId "com.r3"

android/app/src/main/java/com/r3/MainApplication.java

@@ -5,8 +5,6 @@
 import com.facebook.react.ReactApplication;
 import com.oblador.vectoricons.VectorIconsPackage;
 import com.airbnb.android.react.maps.MapsPackage;
-import com.oblador.vectoricons.VectorIconsPackage;
-import com.airbnb.android.react.maps.MapsPackage;
 import com.facebook.react.ReactNativeHost;
 import com.facebook.react.ReactPackage;
 import com.facebook.react.shell.MainReactPackage;

android/build.gradle

@@ -1,12 +1,28 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
+ext {
+    compileSdkVersion = 27       // Or what version you want (latest is recommended)
+    buildToolsVersion = '27.0.3' // same thing
+}
+
+subprojects { subproject ->
+    afterEvaluate{
+        if((subproject.plugins.hasPlugin('android') || subproject.plugins.hasPlugin('android-library'))) {
+            android {
+                compileSdkVersion rootProject.ext.compileSdkVersion
+                buildToolsVersion rootProject.ext.buildToolsVersion
+            }
+        }
+    }
+}
+
 buildscript {
     repositories {
-        maven {url 'https://maven.google.com'}
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.1.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

android/settings.gradle

@@ -3,9 +3,5 @@ include ':react-native-vector-icons'
 project(':react-native-vector-icons').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-vector-icons/android')
 include ':react-native-maps'
 project(':react-native-maps').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-maps/lib/android')
-include ':react-native-vector-icons'
-project(':react-native-vector-icons').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-vector-icons/android')
-include ':react-native-maps'
-project(':react-native-maps').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-maps/lib/android')
 
 include ':app'

package.json

@@ -8,23 +8,23 @@
     "lint": "standard"
   },
   "dependencies": {
-    "native-base": "^2.4.2",
+    "native-base": "^2.4.4",
     "prop-types": "^15.6.1",
-    "react": "^16.3.0-alpha.1",
-    "react-native": "^0.54.0",
+    "react": "^16.3.2",
+    "react-native": "^0.54.4",
     "react-native-maps": "^0.21.0",
     "react-native-material-ui": "^1.22.2",
     "react-native-vector-icons": "^4.6.0",
     "react-navigation": "^1.5.11",
     "react-redux": "^5.0.7",
-    "redux": "^3.7.2",
+    "redux": "^4.0.0",
     "redux-thunk": "^2.2.0"
   },
   "devDependencies": {
     "babel-jest": "22.4.3",
     "babel-preset-react-native": "4.0.0",
     "jest": "22.4.3",
-    "react-test-renderer": "16.3.0-alpha.3",
+    "react-test-renderer": "^16.3.2",
     "standard": "^11.0.1"
   },
   "jest": {