Create zeroing estimator for absolute and absolute encoder

The same as pot and absolute encoder, but with an absolute encoder that
doesn't do index pulses, but can only go through one rotation.

Change-Id: I4b41df7e93ac4454c9aec0fee3c072b4bc9a57c1
diff --git a/frc971/zeroing/BUILD b/frc971/zeroing/BUILD
index 5955f8b..df85290 100644
--- a/frc971/zeroing/BUILD
+++ b/frc971/zeroing/BUILD
@@ -64,6 +64,7 @@
         "pot_and_absolute_encoder.cc",
         "pot_and_index.cc",
         "pulse_index.cc",
+        "absolute_and_absolute_encoder.cc",
     ],
     hdrs = [
         "absolute_encoder.h",
@@ -72,6 +73,7 @@
         "pot_and_index.h",
         "pulse_index.h",
         "zeroing.h",
+        "absolute_and_absolute_encoder.h",
     ],
     deps = [
         ":wrap",
@@ -91,6 +93,7 @@
         "pot_and_index_test.cc",
         "pulse_index_test.cc",
         "relative_encoder_test.cc",
+        "absolute_and_absolute_encoder_test.cc",
         "zeroing_test.h",
     ],
     deps = [