Added a hybrid KF for the shooter.

Change-Id: If3ba2e6978773aef2e63c9bfeb0cc6e2dec483d5
diff --git a/y2017/control_loops/superstructure/indexer/indexer.cc b/y2017/control_loops/superstructure/indexer/indexer.cc
index 6186f7f..0560ec4 100644
--- a/y2017/control_loops/superstructure/indexer/indexer.cc
+++ b/y2017/control_loops/superstructure/indexer/indexer.cc
@@ -116,7 +116,8 @@
   position_error_ = X_hat_current_(0, 0) - Y_(0, 0);
 
   loop_->Update(disabled);
-  stuck_indexer_detector_->UpdateObserver(loop_->U());
+  stuck_indexer_detector_->UpdateObserver(loop_->U(),
+                                          ::aos::controls::kLoopFrequency);
 }
 
 void IndexerController::SetStatus(IndexerStatus *status) {