Add IntelliJ IDEA project files to .gitignore

Change-Id: I9e1cdf91e1fe0f2f54bfb4f6f98ae4aa7033ed84
diff --git a/.gitignore b/.gitignore
index 194bedc..fc3c0ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,6 @@
 /.classpath
 /.project
 /.settings/org.maven.ide.eclipse.prefs
-/.settings/org.eclipse.m2e.core.prefs
\ No newline at end of file
+/.settings/org.eclipse.m2e.core.prefs
+/.idea
+replication.iml