Convert aos over to flatbuffers

Everything builds, and all the tests pass.  I suspect that some entries
are missing from the config files, but those will be found pretty
quickly on startup.

There is no logging or live introspection of queue messages.

Change-Id: I496ee01ed68f202c7851bed7e8786cee30df29f5
diff --git a/third_party/ceres/examples/BUILD b/third_party/ceres/examples/BUILD
index 1986932..80d9a67 100644
--- a/third_party/ceres/examples/BUILD
+++ b/third_party/ceres/examples/BUILD
@@ -37,7 +37,7 @@
 
 EXAMPLE_DEPS = [
     "//:ceres",
-    "@//third_party/eigen",
+    "@org_tuxfamily_eigen//:eigen",
     "@com_github_gflags_gflags//:gflags",
 ]