ignore .iml files (IntelliJ)

Test: N/A
Bug: N/A
Change-Id: I8917fd887b86a39c056d7bf04fd647fc8172c398
diff --git a/.gitignore b/.gitignore
index f1f4a52..54c90ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+*.iml
 *.pyc
 *.swp
 blueprint/