SupportLeanbackShowcase: bring gradle, build tools, lib up to date

Change-Id: I829aba8ca84065efda5aa37976067010c6adc1cb
diff --git a/samples/SupportLeanbackShowcase/app/build.gradle b/samples/SupportLeanbackShowcase/app/build.gradle
index f42d951..2b817d3 100644
--- a/samples/SupportLeanbackShowcase/app/build.gradle
+++ b/samples/SupportLeanbackShowcase/app/build.gradle
@@ -2,7 +2,7 @@
 
 android {
     compileSdkVersion 'android-N'
-    buildToolsVersion "24.0.0 rc1"
+    buildToolsVersion "24.0.0 rc3"
 
     defaultConfig {
         applicationId "android.support.v17.leanback.supportleanbackshowcase"
@@ -31,6 +31,6 @@
     compile "com.android.support:preference-v14:${supportLibVersion}"
 
     compile "com.google.code.gson:gson:1.7.2"
-    compile "com.squareup.picasso:picasso:2.3.2"
+    compile "com.squareup.picasso:picasso:2.5.2"
     compile "com.android.support:palette-v7:${supportLibVersion}"
 }
diff --git a/samples/SupportLeanbackShowcase/build.gradle b/samples/SupportLeanbackShowcase/build.gradle
index 31c6a99..b8ec678 100644
--- a/samples/SupportLeanbackShowcase/build.gradle
+++ b/samples/SupportLeanbackShowcase/build.gradle
@@ -18,7 +18,7 @@
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.2.3'
+        classpath 'com.android.tools.build:gradle:2.1.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/samples/SupportLeanbackShowcase/gradle/wrapper/gradle-wrapper.properties b/samples/SupportLeanbackShowcase/gradle/wrapper/gradle-wrapper.properties
index 0c71e76..fdb8024 100644
--- a/samples/SupportLeanbackShowcase/gradle/wrapper/gradle-wrapper.properties
+++ b/samples/SupportLeanbackShowcase/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-bin.zip