Add Gradle 1.3

Change-Id: I5bc5ab2e91d51dadb43bfd91e8125f0c7c390ad6
diff --git a/PREBUILT b/PREBUILT
new file mode 100644
index 0000000..603cab3
--- /dev/null
+++ b/PREBUILT
@@ -0,0 +1,3 @@
+This was downloaded from gradle.org:
+
+http://services.gradle.org/distributions/gradle-1.3-all.zip