<NME> gradle-wrapper.properties
<BEF> #Sun Nov 08 18:01:05 CET 2015
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-bin.zip

<MSG> use gradle distribution with sources

That way IDEA/Android Studio can show DSL source information.

<DFF> @@ -1,6 +1,6 @@
-#Sun Nov 08 18:01:05 CET 2015
+#Sun Nov 15 08:53:18 CET 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-all.zip

use gradle distribution with sources