up gradle version for wrapper in buld script

build.gradle

@@ -93,7 +93,7 @@ task mergedSource(type: Copy){
 }
 
 task wrapper(type: Wrapper, description: 'Creates and deploys the Gradle wrapper to the current directory.') {
-    gradleVersion = '1.10'
+    gradleVersion = '1.11'
 }
 
 //class IncrementalReverseTask extends DefaultTask {