Add .iml files to .gitignore

Change-Id: Ia4bf1c59aed8877934621855afb23196352da38c
diff --git a/.gitignore b/.gitignore
index 8cb536c..8bc2e12 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 .project
 .settings
 *.swp
+*.iml