build: Switch to use gradle wrapper

Change-Id: I13ed44edc30badebbe325e2cabd4cbd857f065ad
diff --git a/app/build.gradle b/app/build.gradle
index 9695397..50234dd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -99,6 +99,11 @@
     }
 
     clean.dependsOn cleanNative
+
+    // TODO: remove after switching to jndn-management:1.1.0
+    lintOptions {
+        abortOnError false
+    }
 }
 
 def getNdkBuildCmd() {