bump tools

* gradle 2.14.1
* gradle plugin 2.2.0
* build tools 24.0.2
* support library 24.2.+
* target sdk 24

Change-Id: Ie327d2ea305ad31fd2771577bbd325d1a3ca4a72
diff --git a/ring-android/build.gradle b/ring-android/build.gradle
index a7a159e..b525272 100644
--- a/ring-android/build.gradle
+++ b/ring-android/build.gradle
@@ -4,7 +4,7 @@
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.2'
+        classpath 'com.android.tools.build:gradle:2.2.0'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -20,5 +20,5 @@
 dependencies {
 }
 task wrapper(type: Wrapper) {
-    gradleVersion = '2.10' //version required
+    gradleVersion = '2.14.1' //version required
 }