Exclude bin directory from IntelliJ Bazel project

This directory is sometimes created by Eclipse, and contains some BUILD
files, which confuse and/or slow down IntelliJ's Bazel processing.

Change-Id: I2e596f2800d54b524b4c10651cbc7ea0dbddda40
diff --git a/.bazelproject b/.bazelproject
index e3a7a9c..8a726eb 100644
--- a/.bazelproject
+++ b/.bazelproject
@@ -4,6 +4,7 @@
 
 directories:
   .
+  -bin
   -eclipse-out
   -contrib
   -gerrit-package-plugins