Build with 2.2

Change-Id: Ifc0c3020e160d9f882448a968bfbd81d6fbdc805
diff --git a/wrapper/gradle-wrapper.properties b/wrapper/gradle-wrapper.properties
index a71c5dd..bc6c615 100644
--- a/wrapper/gradle-wrapper.properties
+++ b/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=../../external/gradle/gradle-2.4-20150121230028+0000-bin.zip
+distributionUrl=../../external/gradle/gradle-2.2-bin.zip