add lint.xml to ignore invalidPackage from freemarker

.gitignore

@@ -18,7 +18,6 @@ target/
 # Local configuration files (sdk path, etc)
 local.properties
 tests/local.properties
-lint.xml
 
 # Mac .DS_Store files
 .DS_Store

lint.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<lint>
+    <issue id="InvalidPackage">
+        <ignore path="**/freemarker-2.3.23.jar"/>
+    </issue>
+</lint>