bump android gradle to 3.1.4 (#20767)

Summary:
Bump android gradle plugin to 3.1.4. We have been stay to 2.x too long. With 3.x we can have instant run and great performance and new features brought by google.

Also thanks to CFKevinRef great pr to make this possible.
pass all current ci. I have also tested RNTester release version works without crash.
facebook/react-native#17967.
 [GENERAL] [ANDROID] [FEATURE] - bump android gradle to 3.1.4
Pull Request resolved: facebook/react-native#20767

Differential Revision: D9437576

Pulled By: hramos

fbshipit-source-id: 6084056a1390582a75a879918f2538b0480f6299

Author: gengjiawen

templates/HelloWorld/android/app/build.gradle

@@ -137,9 +137,9 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: "libs", include: ["*.jar"])
-    compile "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
-    compile "com.facebook.react:react-native:+"  // From node_modules
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
+    implementation "com.facebook.react:react-native:+"  // From node_modules
 }
 
 // Run this once to be able to run the application with BUCK

templates/HelloWorld/android/build.gradle

@@ -3,13 +3,10 @@
 buildscript {
     repositories {
         jcenter()
-        maven {
-            url 'https://maven.google.com/'
-            name 'Google'
-        }
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.1.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -24,10 +21,7 @@ allprojects {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
             url "$rootDir/../node_modules/react-native/android"
         }
-        maven {
-            url 'https://maven.google.com/'
-            name 'Google'
-        }
+        google()
     }
 }