tools: bump gradle

Tuleap: #330
Change-Id: Ifdf611d63cb9d11f6e6d41dd3f17f525429d217c

ring-android/build.gradle

@@ -4,7 +4,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.5.+'
+        classpath 'com.android.tools.build:gradle:2.0.+'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -19,5 +19,5 @@ allprojects {
 dependencies {
 }
 task wrapper(type: Wrapper) {
-    gradleVersion = '2.8' //version required
+    gradleVersion = '2.10' //version required
 }

ring-android/gradle/wrapper/gradle-wrapper.properties

-#Wed Jun 17 18:34:27 EDT 2015
+#Mon Jan 18 12:07:13 EST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip