add some metafiles to .gitignore
diff --git a/.gitignore b/.gitignore
index 5eed4c1..53a7a4f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,8 +9,11 @@
 .project
 .classpath
 .settings
+.checkstyle
 
 # OSX
 .DS_Store
 
 .java-version
+*.versionsBackup
+