Remove Buck and Maven entries from .gitignore

Change-Id: I765cc887aa33ec79c3ebeca116b7c1481924227c

.gitignore

diff --git a/.gitignore b/.gitignore
index 07ac684..2c3dd3f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,4 @@
-/.buckd/
-/.buckversion
 /.classpath
 *.DS_Store
 /.project
 /.settings
-/.watchmanconfig
-/buck-out/
-/bucklets
-/eclipse-out/
-/target