Clean up .gitignore

Change-Id: Ie15029a989a70b205561d49fa18609f460ff94e8

.gitignore

diff --git a/.gitignore b/.gitignore
index 5b395a0..f5c0727 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,9 +3,7 @@
 /.watchmanconfig
 /buck-out
 /bucklets
-/target
 /.classpath
 /.project
-/.settings/org.maven.ide.eclipse.prefs
-/.settings/org.eclipse.m2e.core.prefs
+/.settings
 /eclipse-out