Ignore IntelliJ *.iml files

Change-Id: I6c722396f5d995e631af78deb7c02017f10eccfd

.gitignore

diff --git a/.gitignore b/.gitignore
index ea5889f..7388c18 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 /.buckd
 /buck-cache
 /buck-out
+*.iml