Cleanup .gitignore

Change-Id: Ia50870faea5f18ccfbab39440e6a9bacb6919d29
diff --git a/.gitignore b/.gitignore
index e034f3b..499784b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,4 @@
-/bucklets
-/target
-/.buckversion
 /.classpath
 /.project
 /.settings/org.maven.ide.eclipse.prefs
 /.settings/org.eclipse.m2e.core.prefs
-/.buckd
-/.watchmanconfig
-/buck-out