Merge pull request #3834 from jimbeveridge/studio-2.1

Upgrade gradle files for Android Studio 2.1

examples/hello_android/build.gradle

@@ -4,7 +4,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.5.0'
+        classpath 'com.android.tools.build:gradle:2.1.0'
     }
 }
 
@@ -13,5 +13,5 @@ task clean(type: Delete) {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '2.8'
+    gradleVersion = '2.10'
 }

examples/hello_android/buildSrc/build.gradle

@@ -3,5 +3,5 @@ repositories {
 }
 
 dependencies {
-  compile "com.android.tools.build:gradle:1.5.0"
+  compile "com.android.tools.build:gradle:2.1.0"
 }