Fixing gradle version conflicts

Change-Id: Icf36c314f5cafa7c43771ea8aabec22db743424d
diff --git a/build.gradle b/build.gradle
index c14996d..ee7426b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,7 +3,7 @@
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:+'
+        classpath 'com.android.tools.build:gradle:1.5.0'
     }
 }