Update .gitignore files

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1591844 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b302b02
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/jackrabbit