Move all floats to doubles

The code was developed initially around a pid loop implemented using
floats.  Therefore, the code was converting back and forth between
double for sensor values as inputs and outputs from this PID loop.

Change-Id: I2d2919e1165103040729c9f16bb84fde3dd6b81b
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/controller_mock.hpp b/test/controller_mock.hpp
index c0af859..94c7cb5 100644
--- a/test/controller_mock.hpp
+++ b/test/controller_mock.hpp
@@ -14,7 +14,7 @@
     {
     }
 
-    MOCK_METHOD0(inputProc, float());
-    MOCK_METHOD0(setptProc, float());
-    MOCK_METHOD1(outputProc, void(float));
+    MOCK_METHOD0(inputProc, double());
+    MOCK_METHOD0(setptProc, double());
+    MOCK_METHOD1(outputProc, void(double));
 };