Ignore IntelliJ data directory

.jwb is used by bazel intellij plugin to store build status.
.idea is used by IntelliJ to store information about the project.

Change-Id: Id67768b720f7f39dc46538fc406c9aa36ac96ff7
diff --git a/.gitignore b/.gitignore
index d11829c..da0519e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@
 .project
 .settings/
 target/
+.idea/
+.ijwb/